Secure communication method and system for network equipment

Abstract

The invention provides a network equipment safety communication method and system, and relates to the technical field of wireless communication, and the method comprises the steps: obtaining a preset leader sequence in a wireless frame based on a network physical layer; wherein the preset leader sequence is constructed by the sending end according to the number of preset long training fields corresponding to the wireless network and the content of the preset long training fields; when it is determined that information in the preset preamble sequence is the same as target preamble sequence information, the wireless frame sent by the sending end continues to be received, and the target preamble sequence information is the number of long training fields configured in a receiving end and the content of the long training fields. According to the invention, the network data transmission security is improved.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to a network equipment secure communication method and system. Background Art

[0002] With the development of intelligent manufacturing, the highly real-time, highly reliable Wireless Network for Industrial Automation (WIA-FA) technology is being widely adopted across key industries. The Media Access Control Address (MAC) layer of WIA-FA technology utilizes a time division multiple access (TDMA)-based access mechanism, ensuring deterministic communication cycles and latency, making it ideally suited for industrial control applications. In industrial scenarios, wireless communication, with its flexibility and convenience, has become a crucial method for data transmission, significantly driving the automation and intelligentization of industrial production and playing a key role in improving production efficiency and quality.

[0003] Current wireless network data transmission uses standard communication protocols, often relying on non-physical layer encryption methods. However, encryption algorithms are often cracked, leading to frequent wireless data leakage incidents. Furthermore, common wireless devices such as WiFi and Bluetooth can capture surrounding wireless frame data using standard wireless network cards, thereby obtaining information such as the device's MAC address, posing a significant risk of device information leakage. In existing technologies, the physical layer communication standards of different networks are mutually known, leading to the risk of information leakage between different networks.

[0004] Therefore, there is an urgent need for a network device secure communication method and system to solve the above problems. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention provides a network equipment secure communication method and system.

[0006] The present invention provides a network device secure communication method, applied to a receiving end, comprising: Based on the network physical layer, a preset preamble sequence in the wireless frame is obtained; wherein the preset preamble sequence is constructed by the transmitting end according to the preset number of long training fields and the preset long training field content corresponding to the wireless network in which the transmitting end is located; When it is determined that the information in the preset preamble sequence is the same as the target preamble sequence information, continue to receive the radio frame sent by the transmitting end, wherein the target preamble sequence information is the number of long training fields and the content of the long training fields configured in the receiving end.

[0007] According to a network device secure communication method provided by the present invention, after obtaining the preset preamble sequence in the wireless frame, frequency offset estimation, channel estimation and time synchronization processing are performed according to the long training field in the preset preamble sequence.

[0008] According to a network device secure communication method provided by the present invention, the target preamble sequence information includes at least one set of long training field content; When it is determined that the information in the preset preamble sequence is identical to the target preamble sequence information, continuing to receive the radio frame sent by the transmitting end includes: When it is determined that the information in the preset preamble sequence is identical to at least one group of long training fields in the target preamble sequence information, the radio frame sent by the transmitting end is continued to be received.

[0009] According to a network device secure communication method provided by the present invention, the method further includes: When it is determined that the number of preset long training fields and the content of the preset long training fields in the preset preamble sequence are different from the target preamble sequence information, the reception of the radio frame sent by the transmitting end is terminated.

[0010] According to a network device secure communication method provided by the present invention, the method further includes: receiving a preamble sequence information update instruction sent by a transmitting end; wherein the preamble sequence information update instruction includes long training field quantity update information and / or long training field content update information; The target preamble sequence information is updated according to the preamble sequence information update instruction, or according to the preamble sequence information update instruction and a preset update time period, to obtain updated target preamble sequence information.

[0011] The present invention also provides a network device secure communication method, applied to a sending end, comprising: Obtaining a preset number of long training fields and preset long training field contents corresponding to a target wireless network, wherein the target wireless network is the wireless network in which the transmitting end is located; Constructing a preset preamble sequence and a radio frame in a radio frame to be sent according to the preset number of long training fields and the preset content of the long training fields; Based on the network physical layer, the constructed wireless frame is sent to the receiving end.

[0012] According to a network device secure communication method provided by the present invention, the method further includes: determining a plurality of receiving terminals in the target wireless network; Based on the preset number of long training fields and the preset content of the long training fields, the same target preamble sequence is configured in each of the receiving ends.

[0013] According to a network device secure communication method provided by the present invention, the method further includes: The preset preamble sequence is updated based on a preset update time period or the number of offline receiving end devices, and the target preamble sequence of the corresponding receiving end in the target wireless network is updated according to the updated preset preamble sequence.

[0014] The present invention also provides a network device secure communication method, comprising: The network access device obtains the number of preset long training fields and the content of the preset long training fields corresponding to the target wireless network, wherein the target wireless network is the wireless network in which the network access device is located; The network access device constructs a preset preamble sequence and a radio frame in a radio frame to be sent according to the preset number of long training fields and the preset content of the long training fields; The network access device sends the constructed wireless frame to the network wireless device based on the network physical layer; The network wireless device obtains the preset preamble sequence in the wireless frame based on the network physical layer; When the network wireless device determines that the information in the preset preamble sequence is the same as the target preamble sequence information, the network wireless device continues to receive the wireless frame sent by the network access device, wherein the target preamble sequence information is the number of long training fields and the content of the long training fields configured in the network wireless device.

[0015] The present invention also provides a network device security communication system, which is applied to a receiving end and includes: A receiving module, configured to obtain a preset preamble sequence in a wireless frame based on a network physical layer; wherein the preset preamble sequence is constructed by a transmitting end based on a preset number of long training fields and content of the long training fields corresponding to the wireless network in which the transmitting end is located; and a wireless frame preamble sequence analysis module, configured to, when determining that information in the preset preamble sequence is identical to target preamble sequence information, continue to receive the wireless frame sent by the transmitting end, wherein the target preamble sequence information is the number of long training fields and the content of the long training fields configured in the receiving end.

[0016] The secure communication method and system for network devices provided by the present invention are based on the network physical layer. The transmitter constructs a preset preamble sequence based on the number and content of long training fields preset in the wireless network, and the receiver configures target preamble sequence information. After obtaining the preset preamble sequence of a wireless frame, the receiver compares it with the target preamble sequence information and, based on the comparison result, determines whether to continue receiving the wireless frame, thereby improving network data transmission security. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a flow chart of a secure communication method for network devices provided by the present invention; Figure 2 This is a second flow chart of the network device secure communication method provided by the present invention; Figure 3 The third flowchart of the network device secure communication method provided by the present invention; Figure 4 This is one of the structural diagrams of the network device security communication system provided by the present invention; Figure 5 This is a second structural diagram of the network device security communication system provided by the present invention; Figure 6 This is a schematic structural diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0020] With the development of intelligent manufacturing in China, high-real-time, high-reliability industrial wireless WIA-FA technology has been deployed across key industries. The MAC layer of WIA-FA network technology uses a TDMA-based access mechanism, ensuring deterministic communication cycles and latency, making it suitable for industrial control applications. In some industrial locations, wireless data transmission security has long been a hot topic of discussion and improvement.

[0021] Current wireless network data transmission relies on software encryption. If the encryption algorithm is cracked, wireless data transmission could be leaked. Common wireless devices, such as Wi-Fi and Bluetooth devices, use standard wireless network cards to capture wireless frame data from their surroundings. By analyzing this data, they can obtain information such as the device's MAC address, posing a significant risk of device information leakage. Furthermore, devices on two wireless networks can be mutually compatible and discover each other, potentially creating data leakage and security risks within the network.

[0022] In the existing Open Systems Interconnection (OSI) reference model, most approaches for implementing secure data transmission without a local area network (LAN) are based on the data link layer and above. To ensure inter-device compatibility, these approaches allow wireless modules on devices with the same protocol to fully receive wireless frames and then determine whether to send the data for processing based on the decryption results. However, a password leak can easily lead to data leakage.

[0023] The present invention can be based on the OSI reference model to implement a data transmission method at the physical layer. By changing the wireless waveform format of the wireless frame sent at the physical layer, the mutual isolation between networks is achieved, and the wireless frame waveform format of the current network communication is not configured for devices with the same protocol.

[0024] Figure 1 This is one of the flow charts of the network device secure communication method provided by the present invention, such as Figure 1 As shown, the present invention provides a network device secure communication method, applied to a receiving end, comprising: Step 101: Based on the network physical layer, a preset preamble sequence in a wireless frame is obtained; wherein the preset preamble sequence is constructed by the transmitting end according to the preset number of long training fields and the preset long training field content corresponding to the wireless network in which it is located.

[0025] The present invention supports wireless local area networks (WLANs) composed of two or more wireless devices. For example, device A, device B, and device C are connected. Device A is the access device (i.e., the transmitter), while devices B and C are the field devices (i.e., the receivers). All devices have wireless capabilities and can communicate with each other within the WLAN.

[0026] In the present invention, the transmitter constructs a preset preamble sequence based on the number and content of long training fields (LTFs) pre-set in the wireless network in which it is located, and supports dynamic modification of the number and content of LTFs in the preamble sequence of the physical layer protocol data unit (PPDU) frame. This allows the transmitter to flexibly adjust the parameters of the LTFs based on actual needs, such as different security levels and changes in the network environment, to construct different preset preamble sequences. For example, in scenarios with higher security requirements, the number of LTFs can be increased or their content can be changed to enhance the complexity and uniqueness of the preamble sequence. Furthermore, after receiving the wireless frame, the receiver extracts the preset preamble sequence from the wireless frame. This process is the basis for subsequent sequence matching and judgment. Only by accurately obtaining the preset preamble sequence can subsequent security verification operations be performed.

[0027] Step 102: When it is determined that the information in the preset preamble sequence is the same as the target preamble sequence information, continue to receive the radio frame sent by the transmitting end, wherein the target preamble sequence information is the number of long training fields and the content of the long training fields configured in the receiving end.

[0028] In the present invention, the receiving end can pre-configure target preamble sequence information, which includes the number and content of long training fields. This pre-configured information can be set based on the security requirements and communication specifications of the wireless network and stored in a specific register on the receiving end. For example, the receiving end can store the corresponding number and content of LTFs in a corresponding register based on the network's default settings or administrator configuration, which serves as the basis for subsequent matching.

[0029] After receiving a radio frame and obtaining the preamble sequence, the receiver compares the number and content of LTFs in the preamble sequence with the configured target preamble sequence information (i.e., the information in the registers storing the number and content of LTFs). For example, the receiver checks the number of LTFs in the preamble sequence to ensure they match the number stored in the registers. It also compares the LTF content bit by bit or according to specific encoding rules to ensure they are identical.

[0030] If the information in the preset preamble sequence matches the target preamble sequence, the sender is legitimate. The receiver assumes the wireless frame comes from a trusted source and continues to receive the frame for subsequent data processing and communication operations. Conversely, if the two are different, it indicates a potential security risk, such as a frame sent by an unauthorized device or data tampering. The receiver terminates the wireless frame reception process to prevent potential security threats from affecting the network. This preamble sequence matching mechanism effectively improves the security of network data transmission.

[0031] In the secure communication method for network devices provided by this invention, a transmitting end constructs a preset preamble sequence (and thus a radio frame) based on the number and content of long training fields preset in the wireless network. A receiving end configures target preamble sequence information. After obtaining the preset preamble sequence of a radio frame, the receiving end compares it with the target preamble sequence information and, based on the comparison result, determines whether to continue receiving the radio frame, thereby improving network data transmission security.

[0032] Based on the above embodiment, after obtaining the preset preamble sequence in the radio frame, the method further includes: A first frequency offset estimation and time synchronization process is performed according to the short training field in the preset preamble sequence.

[0033] In the present invention, when the receiving end begins receiving a wireless frame, the physical layer baseband can first process the Short Training Field (STF) in the preset preamble sequence. Because wireless signals are affected by factors such as the Doppler effect and the frequency deviation of the local oscillator of the transceiver during transmission, a deviation between the frequency of the received signal and the frequency of the transmitted signal occurs, i.e., a frequency offset. The physical layer baseband uses the STF to perform an initial frequency offset estimate, also known as a first frequency offset estimate. The STF has a specific structure and characteristics. By analyzing and calculating its relevant characteristics, such as detecting signal phase changes, it can preliminarily estimate the magnitude of the frequency offset, providing a reference for subsequent, more accurate frequency offset correction.

[0034] Time synchronization is crucial for ensuring that receiving devices can accurately receive each symbol in a radio frame. The STF helps the receiver determine the start time of the radio frame, achieving initial time synchronization. The physical layer baseband detects and analyzes the STF to identify the start boundary of the frame, enabling the receiving device to sample and process subsequent signals at the correct time rhythm, avoiding data errors caused by timing deviations. For example, if time synchronization is inaccurate, the receiving device may sample the signal at the wrong time, resulting in received data that is inconsistent with the actual data transmitted.

[0035] Based on the above embodiment, the method may further include: Performing second frequency offset estimation and channel estimation according to the long training field in the preset preamble sequence; The estimation accuracy of the second frequency offset estimation is greater than the estimation accuracy of the first frequency offset estimation.

[0036] In the present invention, the physical layer baseband can also process the LTF in the preset preamble sequence. The LTF contains richer information for more accurate signal processing. In the present invention, the LTF is used to perform precise frequency offset estimation, i.e., the second frequency offset estimation. Compared with the first frequency offset estimation based on the STF, the second frequency offset estimation has higher estimation accuracy. In one embodiment, frequency offset fault, channel estimation and time synchronization processing can also be performed directly based on the LTF. This is because the LTF has a longer duration, has more sampling points, and can provide more accurate frequency offset information. The physical layer baseband further refines the estimated value of the frequency offset through in-depth analysis and calculation of the LTF, thereby more accurately correcting the frequency offset and improving the quality of signal reception. For example, in a high-speed mobile communication scenario, the frequency offset may change rapidly over time. The precise frequency offset estimation based on the LTF can better track such changes and ensure the stability of communication.

[0037] Furthermore, wireless signals are affected by channel effects during transmission, such as multipath and fading, which can cause changes in signal amplitude and phase. Channel estimation involves analyzing the received signal to understand the characteristics of the channel's influence on the signal, allowing the receiving end to perform corresponding compensation and corrections to recover or restore the original transmitted signal. In the present invention, the LTF has a specific structure and content. The receiving end can compare the received LTF with locally stored known LTFs and calculate the difference between the two to estimate parameters such as the channel's frequency response and delay characteristics, providing accurate channel information for subsequent demodulation of the data portion of the frame.

[0038] In the present invention, the first frequency offset estimation is an initial frequency offset estimation based on STF. The duration of STF is short and contains relatively few sampling points. Therefore, the frequency offset information that can be provided is limited, and only a rough frequency offset estimation can be performed. The second frequency offset estimation is a fine frequency offset estimation based on LTF. The duration of LTF is longer and has more sampling points. It can more accurately capture the change of frequency offset, thereby providing a more accurate frequency offset estimation value. This hierarchical processing method of first performing a coarse frequency offset estimation and then performing a fine frequency offset estimation can improve the efficiency and accuracy of frequency offset estimation. The initial coarse frequency offset estimation can quickly make a rough correction to the frequency offset, so that the signal enters a relatively stable range, providing a good foundation for subsequent fine frequency offset estimation. The fine frequency offset estimation can further refine the correction of the frequency offset, ensuring that the frequency of the signal is highly consistent with the frequency of the transmitting end, thereby improving the quality and reliability of signal reception and reducing data transmission errors.

[0039] Based on the above embodiment, the target preamble sequence information may include at least one set of long training field content; When it is determined that the information in the preset preamble sequence is identical to the target preamble sequence information, continuing to receive the radio frame sent by the transmitting end includes: When it is determined that the information in the preset preamble sequence is identical to at least one group of long training fields in the target preamble sequence information, the radio frame sent by the transmitting end is continued to be received.

[0040] In this invention, to ensure inter-device communication performance, devices are configured to support at least one or more LTF sequences. LTFs play a key role in wireless communications, containing important information for channel estimation and synchronization. The present invention utilizes at least two sets of long training fields to provide richer information for channel estimation and synchronization, thereby improving communication accuracy and reliability. For example, in different channel environments, multiple sets of LTFs can more comprehensively reflect channel characteristics, enabling the receiver to more accurately perform channel compensation, reduce signal distortion and bit error rates, and improve communication quality.

[0041] Furthermore, when establishing a wireless local area network (WLAN), the initial configuration of LTF-related registers of network devices may include information indicating the number of LTFs sent / received, the LTF content, and whether LTFs are enabled for network isolation. The wireless devices of the present invention support at least two sets of long training field content, providing a more flexible configuration for network isolation. Different long training field combinations can be used to distinguish different networks or device groups, achieving more refined network isolation. This also facilitates compatibility and interoperability between different devices and networks, allowing the selection of appropriate LTF combinations for communication based on actual needs.

[0042] Specifically, before establishing a wireless LAN, you can perform initial configuration on the LTF-related registers of devices in the network. These registers not only record the number of LTFs, but also store at least one set of different LTF contents. For example, the registers can store LTF sequence 1 and the corresponding send / receive number settings. This configuration provides the foundation for subsequent communication, ensuring that devices can transmit and receive data according to the predetermined LTF information.

[0043] In one embodiment of the present invention, the preset preamble sequence is the preamble sequence information used by the transmitter when sending wireless frames, while the target preamble sequence information is the preamble sequence information that the receiver expects to receive. During communication, the receiver needs to compare the received preset preamble sequence with the stored target preamble sequence information, ensuring that the information in the preset preamble sequence and all long training field contents in the target preamble sequence information are identical, not partially identical. For example, if the target preamble sequence information contains LTF sequence 1, the preset preamble sequence must also contain this identical sequence for the receiver to consider it a match.

[0044] In a further embodiment, when the access device activates LTF to implement the network isolation function, the access device's frames can only be received normally if the number of LTFs and the LTF content configuration in the on-site device are the same as those of the access device. This requires that the receiving end must strictly check the contents of all long training fields when determining whether the preset preamble sequence is the same as the target preamble sequence. Because different long training field combinations may represent different networks or device groups, only a complete match can ensure that the receiving end is a legitimate device that can communicate with the transmitting end, thereby achieving the purpose of network isolation. For example, when the target preamble sequence information includes at least one set of long training field content, it is necessary to determine that the information in the preset preamble sequence is the same as the two sets of long training field contents in the target preamble sequence information before continuing to receive the wireless frames sent by the transmitting end.

[0045] The embodiments of the present invention can avoid erroneous reception caused by partial matching by strictly matching the contents of all long training fields. In a wireless local area network, there may be multiple devices sending signals at the same time. If the receiving end only performs partial matching, it may receive interference signals or malicious attack signals from other networks. Requiring that the contents of all long training fields are the same can effectively filter out these illegal signals and ensure that the received wireless frames are from the legitimate sending end, thereby improving the security and accuracy of communications. At the same time, the present invention supports at least one group of long training field contents and performs strict matching, providing a more refined network management method. Different long training field combinations can be configured according to different business requirements, security levels or device types, and the network can be divided into multiple logical subnets. Devices between different subnets can be isolated and communication controlled by LTF matching, thereby achieving reasonable allocation and effective protection of network resources.

[0046] Based on the above embodiment, the method further includes: When it is determined that the number of preset long training fields and the content of the preset long training fields in the preset preamble sequence are different from the target preamble sequence information, the reception of the radio frame sent by the transmitting end is terminated.

[0047] In an embodiment of the present invention, the receiving end must receive the matching long training field content and number in order to successfully complete the entire wireless frame reception process. LTF plays a vital role in wireless frames. It is not only used by the receiving device to perform precise frequency offset estimation and channel estimation, providing key parameters for accurate demodulation of subsequent frame data, but also serves as an important basis for identity identification and communication compatibility judgment between devices. Only when the number and content of LTFs in the preset preamble sequence detected by the receiving end are completely consistent with the target preamble sequence information pre-configured by itself, does it indicate that the sending end and the receiving end match each other in the communication parameter settings and have the basic conditions for normal communication. Only then will the receiving end continue to receive and process subsequent wireless frame data.

[0048] In the present invention, isolation between devices that support the wireless LAN protocol can be achieved by configuring the sequence content and number of LTFs. When establishing a wireless LAN, different devices or different network areas can be configured with unique LTF parameters according to actual needs. For example, in an enterprise network, in order to ensure the security of internal core data, the LTF of the core department equipment can be configured to a specific sequence and number, which is different from the LTF configuration of the equipment in the ordinary office area. When the access device starts the LTF-based network isolation function, only the field devices with the same LTF number and content configuration as the access device can be identified as legal devices, thereby accessing the network normally and communicating, effectively preventing the access of illegal devices and potential security threats.

[0049] If the number and content of the preset long training fields in the preamble sequence differ from the target preamble sequence information, the receiving end's physical layer baseband triggers an interrupt signal, notifying the upper-layer protocol stack to stop receiving the current radio frame. Simultaneously, the receiving end discards the portion of the received radio frame data, releases the associated receive buffer resources, and restores the receiving device to its initial state, ready to receive the next radio frame. For example, in an actual wireless communication system, upon detecting an LTF mismatch, the receiving end's baseband chip can quickly halt subsequent signal sampling and demodulation operations, avoiding unnecessary resource consumption.

[0050] The target preamble sequence information of the receiving end is not limited to being pre-configured, but may also be dynamically updated. Based on the above embodiment, the method may further include: Receive a preamble sequence information update instruction sent by a transmitting end; wherein the preamble sequence information update instruction includes long training field quantity update information and / or long training field content update information.

[0051] In this invention, a pre-set time period is set. When the network operates in a predetermined manner and reaches this time period, an LTF configuration update is triggered. For example, in some enterprise wireless LANs with extremely high security requirements, a weekly update cycle may be set. At this fixed time each week, the system will automatically initiate the LTF update process. This is to take into account that the network environment may change over time, and potential attack methods may also be constantly updated. Regularly updating the LTF configuration can make it more difficult for attackers to crack it, thereby ensuring the security of network communications.

[0052] At the same time, when the network device goes offline, an update will be triggered immediately. In the present invention, there may be many situations in which a device goes offline, such as device failure, illegal removal, or normal offline maintenance. Once a device goes offline, the overall security situation of the network may change. In order to prevent the offline device from being used by attackers to obtain the current LTF configuration information and then launch an attack on the network, it is necessary to update the number and / or content of LTFs in a timely manner. For example, in an industrial wireless LAN, a sensor device goes offline due to a failure. After the system detects this situation, it will immediately start the LTF update mechanism.

[0053] On the basis of the above embodiment, based on the preamble sequence information update instruction, the method may further include: The target preamble sequence information is updated according to the preamble sequence information update instruction, or according to the preamble sequence information update instruction and a preset update time period, to obtain updated target preamble sequence information.

[0054] In one embodiment of the present invention, when the network triggers an update, the access device generates the update instructions. The access device randomly selects a set of available LTF sequences from a predefined set of available LTF sequences and numbers as the configuration to be updated. This random selection further enhances network security, as it makes it difficult for attackers to predict the LTF configuration to be used in the next update.

[0055] In the present invention, the preamble sequence information update command generated by the access device explicitly includes information about the number of long training fields (LTFs) and the content of the long training fields (LTFs). The number update information specifies the new number of LTFs, while the content update information details the new LTF sequence content. For example, the update command might explicitly instruct a device within the network to update the number of LTFs from 2 to 3 and the LTF content from "010101" to "101010."

[0056] Based on the current LTF configuration used by the network, the access device synchronizes the updated LTF sequence and count configuration to all devices on the network. This ensures that all devices on the network are updated according to the unified configuration, preventing some devices from being updated while others are not, which could lead to communication failures. Furthermore, the access device specifies the time when the updated LTF configuration item takes effect in the update command. For example, the command could specify that the new LTF configuration take effect at the next hour (e.g., 2:00 PM). This allows sufficient time for devices on the network to complete the update and switch to the new configuration at the effective time.

[0057] In an embodiment of the present invention, devices within the network constantly monitor instructions from access devices. Upon receiving a preamble information update instruction, the device parses it and identifies the long training field number update information and long training field content update information contained therein. Based on the parsed update information, the device updates its stored target preamble sequence information. The original number and content of LTFs are replaced with the new number and content specified in the update instruction, resulting in updated target preamble sequence information. For example, if the device originally stored target preamble sequence information with 2 LTFs and "010101" content, upon receiving the update instruction, it would update the number of LTFs to 3 and the content to "101010."

[0058] This LTF configuration update mechanism, triggered periodically or when a device goes offline, along with a strict synchronization and validation process for updated commands, ensures that devices within the network always communicate using the latest and most secure LTF configuration. Even if an attacker obtains previous LTF configuration information, the constant updating of the configuration prevents them from effectively exploiting this outdated information, thus ensuring the security of data communications within the network.

[0059] Figure 2 The second flow chart of the network device security communication method provided by the present invention is as follows: Figure 2 As shown, the present invention provides a network device secure communication method, applied to a sending end, comprising: Step 201: Obtain the preset number of long training fields and the preset long training field content corresponding to a target wireless network, wherein the target wireless network is the wireless network where the transmitting end is located.

[0060] In this invention, the transmitter first determines the LTF configuration parameters specified by its wireless network. In scenarios with multiple wireless local area networks (WLANs), each network has its own unique LTF configuration. Only by accurately obtaining the preset parameters for its own network can the transmitter ensure that the transmitted wireless frames are correctly identified and processed by devices within that network while avoiding confusion and interference with devices on other networks.

[0061] In the present invention, for two or more wireless local area networks, the devices in each network need to configure the number of LTFs and the LTF sequence content to be consistent, and the number of LTFs or the LTF content sequence between different wireless local area network devices may be inconsistent. This means that each wireless network has its own exclusive LTF configuration standard, and the sender can obtain the preset parameters according to this standard. For example, in an enterprise park, multiple wireless local area networks with different purposes may be deployed, such as office networks and production networks. Each network has an independently set number and content of LTFs. The sender of the office network needs to obtain the preset value corresponding to the office network, thereby forming an isolation barrier on the physical layer through the differences in LTF configurations of different networks, making it difficult for devices in external networks to forge or interfere with the communications of this network, reducing the risk of data being eavesdropped and leaked.

[0062] Step 202: Construct a preset preamble sequence and a radio frame in a radio frame to be sent according to the preset number of long training fields and the preset content of the long training fields.

[0063] In this invention, the purpose of constructing a preamble sequence is to embed network-specific identification information at the beginning of a radio frame. This allows the receiver to quickly and accurately identify the transmitter as belonging to the current network and provides the necessary parameters for subsequent operations such as channel estimation and frequency offset correction. Only when a preamble sequence that conforms to the network's LTF configuration is constructed can the receiver successfully complete the reception and demodulation of the radio frame.

[0064] In the present invention, LTF contains information for channel estimation and synchronization. The transmitter constructs the preamble sequence based on the number and content of the acquired preset long training fields, which can ensure that the preamble sequence matches the communication environment of the network. For example, LTF contains 52-bit sequence content, and theoretically there are 2 52 There are a total of possible combinations. Each network can select a specific set of combinations as its own LTF sequence content, and the sender can construct it according to the selected content.

[0065] In one embodiment, because different networks have different LTF configurations, the pre-set preamble sequence is also unique. This enables receivers within the network to distinguish legitimate from illegitimate signals by identifying the preamble sequence, effectively preventing malicious access and interference from external networks and further enhancing the security of network data transmission. Furthermore, LTF updates are triggered based on the LTF configuration's usage period or device offline status. The transmitter will also follow the updated configuration when constructing the preamble sequence, thus adapting to changing security requirements.

[0066] Step 203: Based on the network physical layer, the constructed wireless frame is sent to the receiving end.

[0067] In this embodiment of the present invention, radio frames carrying network-specific identification information (i.e., a preset preamble sequence) are transmitted to enable data transmission and communication between the transmitter and receiver. Because the radio frame contains a preamble sequence constructed based on the network's LTF configuration, the receiver, upon receiving the radio frame, first detects and matches the preamble sequence. Only if the number and content of the LTFs in the preamble sequence match the target preamble sequence information configured by the receiver will the receiver continue to receive and process subsequent data; otherwise, the radio frame will be discarded. This mechanism ensures that radio frames within the wireless local area network (WLAN) are only properly received by the physical layer of devices within that network, effectively isolating communications between different networks and significantly improving the security of WLAN data transmission. Even in complex situations such as dynamic device addition and deletion, or prolonged periods of time, this security can be maintained by regularly updating the LTF configuration.

[0068] The present invention provides a secure communication method for network devices. A transmitting end constructs a preset preamble sequence based on the number and content of long training fields preset in the wireless network, and a receiving end configures target preamble sequence information. After obtaining the preset preamble sequence of a wireless frame, the receiving end compares it with the target preamble sequence information and, based on the comparison result, determines whether to continue receiving the wireless frame, thereby improving network data transmission security.

[0069] Based on the above embodiment, the method may further include: determining a plurality of receiving terminals in the target wireless network; Based on the preset number of long training fields and the preset content of the long training fields, the same target preamble sequence is configured in each of the receiving ends.

[0070] In an embodiment of the present invention, multiple receiving terminals in the target wireless network are first determined, that is, the scope of objects involved in this communication is delineated to ensure that the sent data can be accurately delivered to the device that needs to receive it, avoiding data being sent to irrelevant devices, causing resource waste and security risks.

[0071] In wireless LANs, numerous devices may be communicating simultaneously. Identifying the receiving end helps prevent communication confusion. By identifying the receiving end, the sender can communicate with these devices according to a specific rule and sequence, ensuring efficient and orderly network communication.

[0072] Each device can perform identity authentication and association when accessing a wireless LAN, establishing a connection with the network and determining its affiliation. This affiliation provides the basis for accurately identifying all receiving devices belonging to the target wireless network.

[0073] In this invention, different communication requirements and business scenarios determine which receivers need to communicate with. For example, in a smart factory's wireless local area network, a control device on the production line needs to send control instructions to multiple specific sensor receivers. These receivers can be determined based on the production process and monitoring requirements.

[0074] In an embodiment of the present invention, devices within each network configure the same number of LTFs and LTF sequence content, while devices in different wireless local area networks do not. This ensures that wireless frames within a wireless local area network can only be properly received by the physical layer of devices within that network. Configuring the same target preamble sequence (based on a preset number and content of LTFs) at each receiving end is a key step in achieving this goal. When a transmitter sends a wireless frame with a specific preamble sequence, only the receiving end of the network configured with the same target preamble sequence can correctly identify and demodulate the wireless frame. Devices in other networks, due to preamble sequence mismatches, are unable to properly receive the frame. This achieves physical layer isolation between networks and enhances network security.

[0075] In the present invention, the preamble plays a crucial role in the radio frame, containing information used for channel estimation and synchronization. Only when the receiving end is configured with the same target preamble information as the transmitting end can it accurately perform channel estimation and synchronization operations, thereby correctly receiving and demodulating the subsequent data. The receiving end needs to adjust its reception parameters based on the LTF information in the preamble to adapt to channel variations and ensure accurate data reception.

[0076] During the design and planning phase of a wireless local area network, the present invention pre-defines configuration rules for the number and content of LTFs. These rules can be determined based on a comprehensive consideration of factors such as network security and communication performance. Each receiving end configures the same target preamble sequence information according to these pre-determined rules, ensuring consistency and compatibility of communications within the network. For example, to meet certain security requirements, a specific LTF sequence content may be selected, and the number of LTFs may be fixed for all devices within the network.

[0077] In wireless LAN communications, the transmitter and receiver must work together to complete data transmission. The transmitter constructs the preamble sequence of the radio frame according to the preset LTF configuration, and the receiver must also recognize and process the preamble sequence based on the same configuration; otherwise, normal communication will not be possible.

[0078] Based on the above embodiment, the method may further include: The preset preamble sequence is updated based on a preset update time period or the number of offline receiving end devices, and the target preamble sequence of the corresponding receiving end in the target wireless network is updated according to the updated preset preamble sequence.

[0079] In the present invention, a fixed update period is pre-set, for example, every 24 hours, every week, or every month. When the network's uptime reaches this preset period, an update of the preamble sequence is triggered. This is to address the increasing potential security risks in a network environment over time. For example, in a public wireless LAN, using the same LTF configuration for extended periods of time could allow malicious users to decipher it through long-term monitoring and analysis, thereby threatening network communication security.

[0080] In an embodiment of the present invention, the access device will randomly select a group of available LTF sequence contents or numbers, and the random selection increases the difficulty of cracking. For example, the LTF sequence content originally used is a specific 52-bit combination, and now a new 52-bit combination is randomly generated as the new sequence content. Then, based on the LTF configuration currently used by the network, the LTF sequence content and number configuration to be updated are synchronized to all devices in the network, and the time point when the LTF configuration item to be updated takes effect is indicated. This time point can be effective immediately or set at a specific time in the future to ensure that all devices can be updated in an orderly manner. For example, the new LTF configuration information is sent to all access devices through network broadcasting, and they are informed to start using the new configuration at the next hour.

[0081] Furthermore, the target preamble sequence of the corresponding receiving end in the target wireless network is updated based on the updated preset preamble sequence. After receiving the update instruction, the receiving end can adjust its receiving parameters (target preamble sequence information) according to the new configuration to correctly identify and process wireless frames with the new preamble sequence.

[0082] In this invention, regularly updating the preamble sequence effectively prevents malicious users from cracking the network's communication keys through long-term monitoring and analysis, thereby ensuring the security of data communications between devices on the network. Even if an attacker manages to monitor the network for a certain period of time, the preamble sequence is regularly updated, rendering any previously acquired information useless. Over time, the network environment may change, such as with the addition of new devices or adjustments to the network topology. Regularly updating the preamble sequence allows the network to better adapt to these changes, ensuring stable and reliable communication.

[0083] In one embodiment of the present invention, when the number of offline receiving devices in the target wireless network reaches or exceeds a preset threshold, an update of the preset leading sequence can also be triggered. This is to take into account that the device being offline may mean that the network environment has changed, or there is a potential security threat. For example, if a large number of devices suddenly go offline, it may be that a malicious attacker is trying to interfere with network communications, or there are security risks such as device theft. Similar to the time-based update, the access device will randomly select a group of available LTF sequence contents or numbers to replace the new identifier for network communication. The LTF sequence content and number configuration to be updated are then synchronized to all devices still online in the network, and the effective time point is specified to ensure that the online devices can obtain the new configuration information in a timely manner and update it at the specified time.

[0084] In this embodiment of the present invention, when a receiving device subsequently reconnects to the network, it can be configured according to the updated preamble sequence information, allowing it to communicate normally with other devices on the network. For example, when an offline device reconnects to the network, the access device will send it new LTF configuration information, and the device will make corresponding settings based on this information.

[0085] When a large number of devices go offline, timely updating the preamble sequence can prevent the potential security threat from spreading further. For example, if the offline situation is caused by a malicious attack, updating the preamble sequence prevents the attacker from further exploiting previously acquired information, thus protecting the communication security of the remaining devices on the network. By updating the preamble sequence, communication identification between devices on the network can be re-established, ensuring that devices can communicate normally after reconnecting to the network, thus maintaining stable network operation.

[0086] Figure 3 The third flow chart of the network device security communication method provided by the present invention is as follows: Figure 3 As shown, the present invention provides a network device secure communication method, comprising: Step 301: A network access device obtains a preset number of long training fields and preset long training field contents corresponding to a target wireless network, wherein the target wireless network is the wireless network in which the network access device is located. Step 302: The network access device constructs a preset preamble sequence and a radio frame in a radio frame to be sent according to the preset number of long training fields and the preset content of the long training fields. Step 303: The network access device sends the constructed wireless frame to the network wireless device based on the network physical layer; Step 304: The network wireless device obtains the preset preamble sequence in the wireless frame based on the network physical layer; Step 305: When the network wireless device determines that the information in the preset preamble sequence is the same as the target preamble sequence information, the network wireless device continues to receive the wireless frame sent by the network access device, wherein the target preamble sequence information is the number of long training fields and the content of the long training fields configured in the network wireless device.

[0087] In the present invention, a network access device first determines the LTF configuration parameters specified by its wireless network. In scenarios with multiple wireless local area networks (WLANs), each network has its own unique LTF configuration. Only by accurately obtaining the preset parameters for its own network can the network access device ensure that the transmitted wireless frames are correctly identified and processed by the wireless devices within that network, while also avoiding confusion and interference with devices on other networks.

[0088] In one embodiment of the present invention, for two or more wireless local area networks, the devices in each network need to configure the number of LTFs and the LTF sequence content to be consistent, and the number of LTFs or the LTF content sequence between different wireless local area network devices must be inconsistent. This means that each wireless network has its own exclusive LTF configuration standard, and the network access device must obtain the preset parameters according to this standard. For example, in an enterprise park, multiple wireless local area networks with different purposes may be deployed, such as office networks and production networks. Each network has an independently set number and content of LTFs. The network access device of the office network needs to obtain the preset value corresponding to the office network, thereby forming an isolation barrier on the physical layer through the differences in LTF configurations of different networks, making it difficult for devices in external networks to forge or interfere with the communications of this network, reducing the risk of data being eavesdropped and leaked.

[0089] In this embodiment of the present invention, the network access device constructs a pre-set preamble sequence to embed network-specific identification information at the beginning of a radio frame. This allows the network wireless device to quickly and accurately identify whether the network access device belongs to the network and provides the necessary parameters for subsequent operations such as channel estimation and frequency offset correction. Only when the preamble sequence conforms to the network's LTF configuration can the network wireless device successfully complete the reception and demodulation of the radio frame.

[0090] In the present invention, LTF contains information for channel estimation and synchronization. The network access device constructs the preamble sequence based on the number and content of the acquired preset long training fields, which can ensure that the preamble sequence matches the communication environment of the network. For example, LTF contains 52-bit sequence content, and theoretically there are 2 52 There are a total of possible combinations. Each network can select a specific set of combinations as its own LTF sequence content, and the network access device will build according to this selected content.

[0091] Because LTF configurations vary across networks, the pre-set preamble sequences constructed by network access devices are also unique. This allows wireless devices within the network to distinguish legitimate from illegitimate signals by identifying the preamble sequence, effectively preventing malicious access and interference from external networks and further enhancing the security of network data transmission. Furthermore, LTF updates are triggered based on the LTF configuration's usage period or device offline status. Network access devices will also follow the updated configuration when constructing preamble sequences, adapting to evolving security requirements.

[0092] Furthermore, network access devices can transmit radio frames carrying network-specific identification information (i.e., a pre-set preamble sequence) to enable data transmission and communication between the network access device and network wireless devices. Because radio frames contain preamble sequences constructed based on the network's LTF configuration, network wireless devices first detect and match the preamble sequence upon receiving a radio frame. Only if the number and content of LTFs in the preamble sequence match the receiver's own configuration will the network wireless device continue to receive and process subsequent data; otherwise, the radio frame will be discarded. This mechanism ensures that radio frames within the wireless LAN are properly received only by devices within the physical layer of the network, effectively isolating communications between different networks and significantly enhancing the security of wireless LAN data transmission. Regularly updating the LTF configuration ensures this security even in complex situations such as dynamic device joining and leaving the wireless LAN, or prolonged periods of device disconnection.

[0093] The present invention supports wireless local area networks (WLANs) composed of two or more wireless devices. For example, device A, device B, and device C are used as access devices (i.e., network access devices). Device A and device B and device C are used as field devices (i.e., network wireless devices). All devices have wireless capabilities and can communicate and interact within the WLAN.

[0094] In an embodiment of the present invention, a network access device constructs a preset preamble sequence based on the number and content of long training fields pre-set by the wireless network in which it is located. It also supports dynamic modification of the number and content of LTFs in the preamble sequence of a transmitted physical layer protocol data unit frame. This allows the network access device to flexibly adjust LTF parameters based on actual needs, such as different security levels and network environment changes, to construct different preset preamble sequences. For example, in scenarios with higher security requirements, the number of LTFs can be increased or their content modified to enhance the complexity and uniqueness of the preamble sequence. Furthermore, after receiving a wireless frame, the network wireless device extracts the preset preamble sequence from the wireless frame. This process forms the basis for subsequent preamble sequence matching and verification. Only by accurately obtaining the preset preamble sequence can subsequent security verification operations be performed.

[0095] In one embodiment of the present invention, a network wireless device can be preconfigured with target preamble sequence information, including the number and content of long training fields. This preconfigured information can be set based on the security requirements and communication specifications of the wireless network and stored in a register specific to the network wireless device. For example, the network wireless device can store the corresponding number and content of LTFs in a corresponding register based on the network's default settings or administrator configuration, which serves as a basis for subsequent matching.

[0096] After receiving the preamble sequence, the wireless device compares the number and content of LTFs in it with the configured target preamble sequence information (i.e., the information stored in the register that stores the number and content of LTFs). For example, the wireless device checks the number of LTFs in the preamble sequence to see if it matches the number stored in the register. It also compares the LTF content bit by bit or according to specific encoding rules to see if they are identical.

[0097] If the information in the preset preamble sequence matches the target preamble sequence, the network access device is legitimate. The network wireless device assumes the wireless frame comes from a trusted source and continues to receive the wireless frame from the network access device for subsequent data processing and communication operations. Conversely, if the two are different, it indicates a potential security risk, such as a frame sent by an unauthorized device or data tampering. The network wireless device terminates the wireless frame reception process to prevent potential security threats from affecting the network. This preamble sequence matching mechanism effectively improves the security of network data transmission.

[0098] The present invention provides a secure communication method for network devices. A transmitting end constructs a preset preamble sequence based on the number and content of long training fields preset in the wireless network, and a receiving end configures target preamble sequence information. After obtaining the preset preamble sequence of a wireless frame, the receiving end compares it with the target preamble sequence information and, based on the comparison result, determines whether to continue receiving the wireless frame, thereby improving network data transmission security.

[0099] Based on the above embodiment, the method further includes: The network access device updates the preset preamble sequence based on a preset update time period or the number of offline network wireless devices, and generates a corresponding preamble sequence information update instruction based on the updated preset preamble sequence to send to the network wireless device.

[0100] The network wireless device receives the preamble sequence information update instruction sent by the network access device; wherein the preamble sequence information update instruction includes long training field quantity update information and / or long training field content update information.

[0101] The network wireless device updates the target preamble sequence information according to the preamble sequence information update instruction, or according to the preamble sequence information update instruction and the preset update time period, to obtain updated target preamble sequence information.

[0102] In the present invention, the network access device will randomly select a group of available LTF sequence contents or numbers, and the random selection increases the difficulty of cracking. For example, the LTF sequence content originally used is a specific 52-bit combination, and now a new 52-bit combination is randomly generated as the new sequence content. Then, based on the LTF configuration currently used by the network, the network access device will synchronize the LTF sequence content and number configuration to be updated to all network wireless devices in the network, and at the same time indicate the time point when the LTF configuration item to be updated takes effect. This time point can be effective immediately or set at a specific time in the future to ensure that all devices can be updated in an orderly manner. For example, the new LTF configuration information is sent to all network access devices through network broadcasting, and they are informed to start using the new configuration at the next hour.

[0103] Furthermore, the network access device updates the target preamble sequence of the corresponding network wireless device in the target wireless network based on the updated preset preamble sequence. Upon receiving the update instruction, the network wireless device adjusts its receiving parameters according to the new configuration to correctly identify and process wireless frames with the new preamble sequence.

[0104] In this invention, regularly updating the preamble sequence effectively prevents malicious users from cracking the network's communication keys through long-term monitoring and analysis, thereby ensuring the security of data communications between devices on the network. Even if an attacker manages to monitor the network for a certain period of time, the preamble sequence is regularly updated, rendering any previously acquired information useless. Over time, the network environment may change, such as with the addition of new devices or adjustments to the network topology. Regularly updating the preamble sequence allows the network to better adapt to these changes, ensuring stable and reliable communication.

[0105] In one embodiment of the present invention, when the number of offline receiving devices in the target wireless network reaches or exceeds a preset threshold, an update of the preset leading sequence can be triggered. This is to take into account that the device being offline may mean that the network environment has changed, or there is a potential security threat. For example, if a large number of devices are suddenly offline, it may be that a malicious attacker is trying to interfere with network communications, or there are security risks such as device theft. Similar to the time-based update, the network access device will randomly select a group of available LTF sequence contents or numbers to replace the new identifier for network communication. The LTF sequence content and number configuration to be updated are then synchronized to all devices still online in the network, and the effective time point is indicated to ensure that the online devices can obtain the new configuration information in a timely manner and update it at the specified time.

[0106] In the present invention, wireless network devices that subsequently reconnect to the network are configured according to the updated preamble sequence information upon reconnection, enabling normal communication with other devices on the network. For example, when an offline device reconnects to the network, the network access device sends it new LTF configuration information, and the device makes appropriate settings based on this information.

[0107] When a large number of devices go offline, timely updating the preamble sequence can prevent the potential security threat from spreading further. For example, if the offline situation is caused by a malicious attack, updating the preamble sequence prevents the attacker from further exploiting previously acquired information, thus protecting the communication security of the remaining devices on the network. By updating the preamble sequence, communication identification between devices on the network can be re-established, ensuring that devices can communicate normally after reconnecting to the network, thus maintaining stable network operation.

[0108] The network device secure communication system provided by the present invention is described below. The network device secure communication system described below and the network device secure communication method described above can be referenced to each other.

[0109] Figure 4 This is one of the structural diagrams of the network device security communication system provided by the present invention. Figure 4As shown, the present invention provides a network device security communication system, which is applied to a receiving end, and includes a receiving module 401 and a wireless frame preamble sequence analysis module 402, wherein the receiving module 401 is used to obtain a preset preamble sequence in a wireless frame based on a network physical layer; wherein the preset preamble sequence is constructed by the transmitting end according to a preset number of long training fields and a preset long training field content corresponding to the wireless network in which it is located; the wireless frame preamble sequence analysis module 402 is used to continue receiving the wireless frame sent by the transmitting end when it is determined that the information in the preset preamble sequence is the same as the target preamble sequence information, wherein the target preamble sequence information is the number of long training fields and the long training field content configured in the receiving end.

[0110] In the secure communication system for network devices provided by the present invention, a transmitting end constructs a preset preamble sequence based on the number and content of long training fields preset in the wireless network, and a receiving end configures target preamble sequence information. After obtaining the preset preamble sequence of a wireless frame, the receiving end compares it with the target preamble sequence information and, based on the comparison result, determines whether to continue receiving the wireless frame, thereby improving network data transmission security.

[0111] Figure 5 This is the second structural diagram of the network equipment security communication system provided by the present invention. Figure 5 As shown, the present invention provides a network device security communication system, which is applied to a sending end, and includes a configuration module 501, a wireless frame preamble sequence construction module 502 and a sending module 503, wherein the configuration module 501 is used to obtain a preset number of long training fields and a preset long training field content corresponding to a target wireless network, wherein the target wireless network is the wireless network in which the sending end is located; the wireless frame preamble sequence construction module 502 is used to construct a preset preamble sequence and a wireless frame in a wireless frame to be sent according to the preset number of long training fields and the preset long training field content; the sending module 503 is used to send the constructed wireless frame to a receiving end based on the network physical layer.

[0112] In the secure communication system for network devices provided by the present invention, a transmitting end constructs a preset preamble sequence based on the number and content of long training fields preset in the wireless network, and a receiving end configures target preamble sequence information. After obtaining the preset preamble sequence of a wireless frame, the receiving end compares it with the target preamble sequence information and, based on the comparison result, determines whether to continue receiving the wireless frame, thereby improving network data transmission security.

[0113] The system provided in the embodiment of the present invention can be used to execute the above-mentioned method embodiments. Please refer to the above-mentioned embodiments for the specific process and detailed content, which will not be repeated here.

[0114] Figure 6 A schematic diagram of the structure of the electronic device provided by the present invention, such as Figure 6 As shown, the electronic device may include: a processor 601, a communications interface 602, a memory 603, and a communication bus 604. The processor 601, the communications interface 602, and the memory 603 communicate with each other via the communication bus 604. The processor 601 may invoke logic instructions in the memory 603 to execute a method for secure communication in a network device. The method includes: obtaining a preset preamble sequence in a radio frame based on a network physical layer; the preset preamble sequence is constructed by a transmitting end based on a preset number of long training fields and preset long training field content corresponding to the wireless network in which it is located; and, upon determining that the information in the preset preamble sequence is identical to target preamble sequence information, continuing to receive the radio frame sent by the transmitting end, wherein the target preamble sequence information is the number of long training fields and the content of the long training fields configured at the receiving end.

[0115] Or, obtain the preset number of long training fields and the preset long training field content corresponding to the target wireless network, wherein the target wireless network is the wireless network in which the transmitting end is located; construct a preset preamble sequence and a wireless frame in the wireless frame to be sent according to the preset number of long training fields and the preset long training field content; and send the constructed wireless frame to the receiving end based on the network physical layer.

[0116] Alternatively, the network access device obtains a preset number of long training fields and preset long training field content corresponding to a target wireless network, wherein the target wireless network is the wireless network in which the network access device is located; the network access device constructs a preset preamble sequence and a wireless frame in a wireless frame to be sent based on the preset number of long training fields and the preset long training field content; the network access device sends the constructed wireless frame to the network wireless device based on a network physical layer; the network wireless device obtains the preset preamble sequence in the wireless frame based on the network physical layer; when the network wireless device determines that information in the preset preamble sequence is the same as target preamble sequence information, the network wireless device continues to receive the wireless frame sent by the network access device, wherein the target preamble sequence information is the number of long training fields and the long training field content configured in the network wireless device.

[0117] Furthermore, the logic instructions in the aforementioned memory 603 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0118] On the other hand, the present invention also provides a computer program product, comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions. When the program instructions are executed by a computer, the computer is capable of executing the network device secure communication method provided by the above methods, the method comprising: obtaining a preset preamble sequence in a wireless frame based on a network physical layer; wherein the preset preamble sequence is constructed by a transmitting end based on a preset number of long training fields and preset long training field content corresponding to the wireless network in which it is located; when it is determined that the information in the preset preamble sequence is the same as the target preamble sequence information, continuing to receive the wireless frame sent by the transmitting end, wherein the target preamble sequence information is the number of long training fields and the long training field content configured in the receiving end; Or, obtain the preset number of long training fields and the preset long training field content corresponding to the target wireless network, wherein the target wireless network is the wireless network in which the transmitting end is located; construct a preset preamble sequence and a wireless frame in the wireless frame to be sent according to the preset number of long training fields and the preset long training field content; and send the constructed wireless frame to the receiving end based on the network physical layer.

[0119] Alternatively, the network access device obtains a preset number of long training fields and preset long training field content corresponding to a target wireless network, wherein the target wireless network is the wireless network in which the network access device is located; the network access device constructs a preset preamble sequence in a wireless frame to be sent based on the preset number of long training fields and the preset long training field content; the network access device sends the constructed wireless frame to the network wireless device based on a network physical layer; the network wireless device obtains the preset preamble sequence in the wireless frame based on the network physical layer; when the network wireless device determines that the information in the preset preamble sequence is the same as the target preamble sequence information, the network wireless device continues to receive the wireless frame sent by the network access device, wherein the target preamble sequence information is the number of long training fields and the long training field content configured in the network wireless device.

[0120] In yet another aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method for secure communication of a network device provided in each of the above embodiments is implemented. The method includes: obtaining a preset preamble sequence in a wireless frame based on a network physical layer; wherein the preset preamble sequence is constructed by a transmitting end based on a preset number of long training fields and preset long training field content corresponding to the wireless network in which the transmitting end is located; and when it is determined that the information in the preset preamble sequence is the same as target preamble sequence information, continuing to receive the wireless frame sent by the transmitting end, wherein the target preamble sequence information is the number of long training fields and the content of the long training fields configured at the receiving end; Or, obtain the preset number of long training fields and the preset long training field content corresponding to the target wireless network, wherein the target wireless network is the wireless network in which the transmitting end is located; construct a preset preamble sequence and a wireless frame in the wireless frame to be sent according to the preset number of long training fields and the preset long training field content; and send the constructed wireless frame to the receiving end based on the network physical layer.

[0121] Alternatively, the network access device obtains a preset number of long training fields and preset long training field content corresponding to a target wireless network, wherein the target wireless network is the wireless network in which the network access device is located; the network access device constructs a preset preamble sequence in a wireless frame to be sent based on the preset number of long training fields and the preset long training field content; the network access device sends the constructed wireless frame to the network wireless device based on a network physical layer; the network wireless device obtains the preset preamble sequence in the wireless frame based on the network physical layer; when the network wireless device determines that the information in the preset preamble sequence is the same as the target preamble sequence information, the network wireless device continues to receive the wireless frame sent by the network access device, wherein the target preamble sequence information is the number of long training fields and the long training field content configured in the network wireless device.

[0122] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0123] Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented using software plus a necessary general-purpose hardware platform, or of course, hardware. Based on this understanding, the essence of the above technical solution, or the portion that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, or an optical disk, and includes a number of instructions for causing a computer device (such as a personal computer, server, or network device) to execute the methods described in each embodiment or certain portions of the embodiments.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A network device secure communication method, characterized in that: Applied to the receiving end, including: Based on the network physical layer, a preset preamble sequence in the wireless frame is obtained; wherein the preset preamble sequence is constructed by the transmitting end according to the preset number of long training fields and the preset long training field content corresponding to the wireless network in which the transmitting end is located; When it is determined that the information in the preset preamble sequence is the same as the target preamble sequence information, continue to receive the radio frame sent by the transmitting end, wherein the target preamble sequence information is the number of long training fields and the content of the long training fields configured in the receiving end.

2. The network device secure communication method according to claim 1, characterized in that: After acquiring the preset preamble sequence in the radio frame, frequency offset estimation, channel estimation and time synchronization processing are performed according to the long training field in the preset preamble sequence.

3. The network device secure communication method according to claim 1 or 2, characterized in that: The target preamble sequence information includes at least one set of long training field content; When it is determined that the information in the preset preamble sequence is identical to the target preamble sequence information, continuing to receive the radio frame sent by the transmitting end includes: When it is determined that the information in the preset preamble sequence is identical to at least one group of long training fields in the target preamble sequence information, the radio frame sent by the transmitting end is continued to be received.

4. The network device secure communication method according to claim 1, wherein: The method further comprises: When it is determined that the number of preset long training fields and the content of the preset long training fields in the preset preamble sequence are different from the target preamble sequence information, the reception of the radio frame sent by the transmitting end is terminated.

5. The network device secure communication method according to claim 1, wherein: The method further comprises: receiving a preamble sequence information update instruction sent by a transmitting end; wherein the preamble sequence information update instruction includes long training field quantity update information and / or long training field content update information; The target preamble sequence information is updated according to the preamble sequence information update instruction, or according to the preamble sequence information update instruction and a preset update time period, to obtain updated target preamble sequence information.

6. A network device secure communication method, characterized in that: Applied to the sending end, including: Obtaining a preset number of long training fields and preset long training field contents corresponding to a target wireless network, wherein the target wireless network is the wireless network in which the transmitting end is located; Constructing a preset preamble sequence and a radio frame in a radio frame to be sent according to the preset number of long training fields and the preset content of the long training fields; Based on the network physical layer, the constructed wireless frame is sent to the receiving end.

7. The network device secure communication method according to claim 6, characterized in that: The method further comprises: determining a plurality of receiving terminals in the target wireless network; Based on the preset number of long training fields and the preset content of the long training fields, the same target preamble sequence is configured in each of the receiving ends.

8. The network device secure communication method according to claim 7, characterized in that: The method further comprises: The preset preamble sequence is updated based on a preset update time period or the number of offline receiving end devices, and the target preamble sequence of the corresponding receiving end in the target wireless network is updated according to the updated preset preamble sequence.

9. A network device secure communication method, characterized in that: include: The network access device obtains the number of preset long training fields and the content of the preset long training fields corresponding to the target wireless network, wherein the target wireless network is the wireless network in which the network access device is located; The network access device constructs a preset preamble sequence and a radio frame in a radio frame to be sent according to the preset number of long training fields and the preset content of the long training fields; The network access device sends the constructed wireless frame to the network wireless device based on the network physical layer; The network wireless device obtains the preset preamble sequence in the wireless frame based on the network physical layer; When the network wireless device determines that the information in the preset preamble sequence is the same as the target preamble sequence information, the network wireless device continues to receive the wireless frame sent by the network access device, wherein the target preamble sequence information is the number of long training fields and the content of the long training fields configured in the network wireless device.

10. A network equipment security communication system, characterized in that: Applied to the receiving end, including: A receiving module, configured to obtain a preset preamble sequence in a wireless frame based on a network physical layer; wherein the preset preamble sequence is constructed by a transmitting end based on a preset number of long training fields and content of the long training fields corresponding to the wireless network in which the transmitting end is located; and a wireless frame preamble sequence analysis module, configured to, when determining that information in the preset preamble sequence is identical to target preamble sequence information, continue to receive the wireless frame sent by the transmitting end, wherein the target preamble sequence information is the number of long training fields and the content of the long training fields configured in the receiving end.

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