3719 results about "Serial code" patented technology

The invention relates to the technical field of knowledge maps, in particular to a knowledge map method and system for multi-source heterogeneous data fusion. The method comprises the following steps: cleaning multi-source data through an auto-encoder, dynamically weighting and standardizing after low-rank decomposition and PCA denoising, aligning GNN entities and authenticating standard approval serial numbers; combining CNN / GNN to extract texts, images and sensor multi-modal features, fusing time sequence information with BiLSTM, and performing weighted aggregation; a BERT-BiLSTM-SelfAttention-CRF is adopted to identify an entity, a GCN inference relationship is adopted, a TransE is embedded into an entity relationship to a low-dimensional space, and the entity relationship is stored to Neo4j to support real-time query; dynamically updating the atlas by incremental learning; and visually displaying the constructed knowledge graph. According to the method, a complete closed loop from data cleaning, multi-modal fusion and graph construction to dynamic optimization is formed, and comprehensiveness, accuracy and expandability of the knowledge graph in a multi-source heterogeneous scene are ensured.

The invention discloses a cloud information system index collection method, system and device and a medium, and relates to the technical field of cloud information system operation and maintaining.The method comprises the steps that information collection interfaces of a cloud system are integrated, data flow information entropy is quantized, and an entropy value sequence is constructed; an interface calling serial number is traced based on a historical log, a calling chain is formed, a directed graph topological structure is established, an influence propagation path of an entropy mutation node is identified, and a collection regulation priority of an interface cluster is determined; an acquisition strategy is formulated in combination with entropy time sequence data and a load level, a state-strategy mapping relation matrix is optimized, and a time period driving type strategy adjustment parameter set is generated; and issuing the strategies in sequence, dynamically regulating and controlling the acquisition frequency, and if state transition or fitting degree abnormity occurs, triggering strategy rollback and optimizing the learning weight. According to the method, on the premise of guaranteeing the integrity of the monitoring data of the power equipment, the utilization rate of edge computing resources is remarkably optimized, and high-timeliness and high-fidelity data support is provided for safe and stable operation of a power grid.

To provide a blockchain-based commodity anti-counterfeit traceability method, an apparatus, and a cloud server that implement a highly reliable anti-counterfeit traceability system.SOLUTION: A method is applied to a cloud server equipped with a blockchain module, the method including: receiving an anti-counterfeit code for a commodity transmitted from a terminal; searching the blockchain module for commodity information corresponding to the anti-counterfeit code; feeding back commodity inquiry failure information to the terminal when no commodity information corresponding to the anti-counterfeit code exists in the blockchain module; and feeding back commodity information to the terminal, the commodity information including shipping information and a serial number of the commodity, when the commodity information corresponding to the anti-counterfeit code exists in the blockchain module.SELECTED DRAWING: Figure 2

The invention discloses a wireless communication network data secure transmission method and system, and relates to the technical field of secure transmission. During system operation, agricultural monitoring data are collected in real time through various sensor devices arranged in an agricultural environment, encryption processing is performed by using a symmetric encryption algorithm, and a dynamic key length adjustment mechanism is supported; a random number generator is integrated, unified management is performed on key generation, distribution, updating and destruction in a system, a timestamp or a random serial number is embedded into each data packet, the uniqueness of the timestamp or the serial number is verified at a receiving end, so that replay attacks are resisted, and the data are comprehensively analyzed and evaluated according to a set algorithm, so that the replay attack is prevented. The method comprises the following steps: acquiring a security data transmission performance index SDTP through calculation, generating a monitoring report, detecting abnormal conditions in a data transmission process, including channel quality reduction, data loss or verification failure, and providing a visual monitoring result.

The invention provides a method and device for realizing cache sharing among lossless network ports, and the method comprises the steps: dividing a receiving side total cache space into a port private space and a multi-port shared space, and setting an upper limit value of the shared space which can be used by each port; based on the port private space residual value and the corrected shared subspace residual value, calculating a credit value representing the corrected total residual space of the port of the side, and feeding back the credit value to the sending side; initiating data message transmission when the sending side equipment meets a preset message sending condition based on the credit value; when the port of the receiving side receives the data message, retransmission verification is carried out, whether the residual cache space is sufficient or not is judged, the message is stored or discarded, an ACK / NAK / CNAK response is triggered, and the response is sent to the sending side equipment; and when the sending side equipment receives the response, analyzing the message serial number in the response and executing retransmission operation or releasing the message retransmission cache space. According to the scheme, the cache utilization rate is increased.

The invention discloses a data slice recombination order-preserving method based on a Beidou short message, which relates to the technical field of data transmission and recombination optimization, and ensures the stability and low error rate of data in the transmission process by dynamically optimizing the size and quantity of slices according to channel bandwidth and delay through a self-adaptive slice adjustment mechanism. A unique serial number identifier and a first check code attached to each fragment are beneficial to identifying data under a complex channel condition, and errors and chaos in a recombination process are reduced. At a receiving end, a conflict analysis model is constructed by analyzing sequence offset and delay conditions of fragment arrival in real time, and a multi-layer correction instruction is provided according to an overall conflict rate and a time sequence consistency coefficient. The order-preserving mechanism ensures that the original order of the data can be maintained even in a complex network environment by preferentially processing the unlocked fragment and generating a retransmission instruction of the lost fragment. The combination of dynamic priority adjustment and a retransmission mechanism promotes the structure of the original data after recombination.

This application relates to data processing methods and apparatuses. In an example method, a receive end obtains first indication information that indicates a maximum serial number of one or more data units that are discarded. The receive end updates a value of a first variable maintained by an entity at the receive end to be greater than the maximum serial number, where the first variable may indicate that a data unit whose serial number is greater than or equal to the value of the first variable is to be processed by the entity at the receive end; or updates a value of a first variable maintained by an entity at the receive end to be equal to the maximum serial number, where the first variable may indicate that a data unit whose serial number is greater than the value of the first variable is to be processed by the entity at the receive end.

The invention provides an intelligent semiconductor wafer spraying control method and system, and the method comprises the steps: obtaining a recommended cleaning time range of a wafer from a preset spraying time-wafer attribute association database according to the material and surface roughness of the wafer; the spraying parameters, obtained in the first three steps, of the sub-areas are integrated, a wafer surface cleaning scheme is formed, the cleaning scheme comprises the nozzle layout, the nozzle number, the spraying liquid components and the temperature of all the sub-areas, and the cleaning scheme is transmitted to a spraying control unit; after cleaning is completed, the surface image of the wafer is compared with a preset standard image, the similarity between the surface image of the wafer and the preset standard image is calculated, if the similarity is lower than a preset threshold value, the serial number and cleaning parameters of the wafer are recorded in an abnormal cleaning log, meanwhile, the wafer is conveyed to an unqualified product cache region, and the unqualified product cache region is used for cleaning the wafer. By means of spraying control, the cleaning efficiency and quality are improved, resource waste is reduced, and an advanced cleaning solution is provided for semiconductor manufacturing.

The invention relates to the technical field of data integrity protection, in particular to a property right registration core data security protection method based on a block chain technology, which comprises the following steps: acquiring an anchor point on an identity data generation chain, verifying a historical block to construct a topological structure, and matching a permission mapping field write-in path. And verifying the node permission and generating a data integrity verification report. According to the method, identity anchoring data is generated by binding a registrant identity credential with an address on a chain, structured identity mapping is realized, historical blocks form a logic closed loop through pointer and serial number verification, the integrity of data circulation is enhanced, a field access boundary is established by matching a field set with a node identifier through an authority level, and the accuracy of access control is enhanced. Field contents are written into nodes according to an addressing protocol and a distributed path index is generated, the flexibility and addressability of data positioning are improved, a verification link is fused with a certificate and an authority label to match and screen credible nodes, and integrated verification of path compliance and access security is realized.

The invention discloses a post-quantum signature method, a post-quantum signature verification method and a related device, OTS signature data and LMS signature data can be generated by using a Chinese Hash algorithm, and the LMS signature data can resist quantum attacks and meet Chinese encryption requirements. The post-quantum signature method comprises the following steps: after selecting an OTS private key from an LMS private key, generating OTS signature data according to a Chinese Hash algorithm, the OTS private key, a first reference random number and a message, generating a Hash tree according to the LMS private key, generating an LMS public key according to a root node of the Hash tree, determining a brother node set in the Hash tree according to a target leaf node corresponding to the OTS private key, and sending the brother node set to the OTS private key; generating LMS signature data according to the serial number of the OTS private key, the OTS signature data, the LMS feature value and the brother node set; and sending the LMS public key, the LMS signature data and the message to a signature verification device.

The invention relates to the technical field of backscatter communication, and discloses a backscatter method for any multi-frequency Bluetooth carrier, which comprises the following steps: a carrier device can send out carrier signals of multiple frequencies; the label modulates label data into a carrier signal to generate a backscattering signal; an edge device identifies a serial number of a corresponding connection event through a data packet in a specific data channel and sends the serial number of the connection event to a label, and the label calculates a corresponding data channel serial number according to the serial number of the connection event, so that the label can reflect carrier signals of different data channels to a fixed channel; identification fields are arranged in data packets corresponding to the carrier signals and the backscattering signals, and label data are decoded based on identification field contents and load contents of the carrier signals and the backscattering signals. The label can accurately control the reflection channel, and meanwhile label data transmission is supported through a provided coding and decoding mechanism.

A delivery unit 15 is mounted on a vehicle 21 and is used to deliver the articles accommodated in a storage container 33 filled with a cooling gas. The delivery unit 15 includes a thermometer Se1 that measures a temperature in the storage container 33, a memory unit 53 that memorizes therein data of the measured temperature in chronological order, a quality-data generation unit 55a that generates quality data of articles based on temperature data acquired from the memory unit 53, a print-data editing unit 55h that edits print data relating to a quality certificate including a graphic image representing the quality in chronological order of the cooling environment in the storage container 33 accommodating articles therein during delivery based on a serial number of the article and the quality data, and a printer 27 that prints print data relating to the quality certificate on a recording medium.

The invention provides a carrying task equipment scheduling method, a scheduling server and a computer readable storage medium. The method comprises the following steps: in response to a carrying task triggered by an upper system, splitting the carrying task according to a required equipment category of the carrying task to obtain a plurality of subtasks with serial numbers; executing a plurality of subtasks in sequence, and determining an optimal carrying path of the current subtask; determining target carrying equipment of the current sub-task based on the target equipment category of the current sub-task and the working state of each carrying equipment in the operation area; calling a program coding plug-in of the target carrying equipment to code the preferable carrying path to obtain first equipment coding information of the current subtask; and calling an interface of the target carrying equipment to push the first equipment coding information to the target carrying equipment so as to schedule the target carrying equipment to execute the current subtask according to the preferred carrying path. The carrying path and the carrying equipment of the carrying task can be planned in real time, and the cargo carrying efficiency is improved.

The invention discloses an equipment upgrading method and device, a storage medium and electronic equipment. The method comprises the following steps: in response to an equipment upgrading request, obtaining an upgrading data packet; determining a target channel model and a target transmission rate; performing division operation on the upgrade data packet to obtain a group of first data blocks; and sequentially sending the group of first data blocks to the to-be-upgraded equipment according to the block serial number, and sending the to-be-upgraded equipment to the to-be-upgraded equipment when the first transmission confirmation result indicates that the sending times of the first data blocks which are not received by the to-be-upgraded equipment in the group of first data blocks meet a preset threshold value. And updating at least one of the size of the first data block, the target channel model and the target transmission rate, and sending the upgrade data packet according to the updated size of the first data block, the target channel model and the target transmission rate. The technical problem that the equipment upgrading efficiency is low due to the fact that the equipment upgrading mode is single and fixed and cannot adapt to variable network environments is solved.

The invention provides a multi-host system and a cross-domain access method. The system comprises a structure manager and at least two host domains, the structure manager is used for discovering and managing a topological structure of the multi-host system, distributing segment serial numbers for hosts and distributing port identification numbers for host edge switches, edge ports and downstream edge switches; the structure manager obtains equipment information of the terminal equipment and sends the equipment information to the host; the host sends a request message to the terminal equipment through the host edge switch via the port-based routing switching network; the downstream edge switch establishes an association relationship between a segment serial number and a port identification number carried in the request message, and maps a physical address of a host needing cross-domain to a physical address of a host subjected to cross-domain; and the downstream edge switch receives the completion message, determines a port identification number corresponding to the segment serial number carried in the completion message based on the association relationship, carries the port identification number in the completion message as a destination end identifier, and sends the port identification number to a corresponding host.

The invention relates to the technical field of food information tracing, in particular to a food information tracing method and system based on laser code spraying. The method comprises the following steps: obtaining production related information; the method comprises the following steps: collecting production data in a food production process, and carrying out blockchain up-chain evidence storage to obtain a blockchain up-chain record; carrying out data association and integration on the block chain uplink record and the production related information, and carrying out multi-dimensional data packet generation to obtain a multi-dimensional data packet; performing Hash calculation on the multi-dimensional data packet to obtain a Hash value of the multi-dimensional data packet; obtaining a unique serial number of the product; performing seed key generation on the Hash value of the multi-dimensional data packet and the unique serial number of the product by using a preset master key, and performing key derivation function calculation to obtain a product key; and according to the multi-dimensional data packet and the product key, performing traceability information encryption to obtain encrypted traceability information. The invention provides a safer, more reliable and more convenient food traceability method through a food information traceability technology.

The invention discloses a high-concurrency data cache sorting method and system, and the method comprises the steps: carrying out the time synchronization of a system server and a subsystem server, building a first-level cache and a second-level cache, and setting a double-buffer queue for the second-level cache; a plurality of threads receive high-concurrency data and distribute different thread groups for processing, a local timestamp and a serial number are set to be combined into a primary key, the primary key and a data value v are written into a first-level cache, and an index is established. A thread pool 1 is started to read data from a first-level cache and write the data into a second-level cache, and corresponding processing including discarding repeated data, writing the data into different buffer queues and the like is carried out by judging conditions such as a sequence number and a data value v. Meanwhile, a thread pool 2 is started to read the data from the second-level cache double-buffering queue in sequence and delete the cache, and if a specific situation is encountered, a threshold value is waited for or next data processing is continued. And the index and the cache queue content can be expanded to realize processing in a plurality of protocol modes, so that the data access efficiency is improved, the data completeness can be realized, and the conditions of data disorder and dirty data cannot occur.

The invention discloses a multi-source heterogeneous protocol analysis method suitable for satellite-borne protocol analysis equipment. The method comprises the steps that 1, a data frame preprocessing module extracts a payload and transmits the payload to a message combination and extraction module; 2, the message combination and extraction module analyzes the segment flag bit in the effective load message header to judge the integrity of the message; if the message is a segmented message, executing data caching and recombination according to the message serial number and the in-segment offset; after an independent message unit, namely a sub-message, in the effective load is recombined, complete sub-message data is transmitted to a parameter processing module to be analyzed; if the message is a non-segmented message, sub-message data is directly extracted and transmitted to a subsequent parameter processing module; and step 3, the parameter processing module analyzes a protocol data unit in the sub-message data, extracts a parameter field, and converts the parameter field into a standard byte stream format to be directly called by satellite-borne processing equipment. Effective data can be quickly and efficiently processed.

The invention provides a network reliability guarantee method and device based on adaptive hop-by-hop caching. The method comprises the following steps: acquiring upstream nodes and downstream nodes in a network; sorting the data packets needing to be cached through the upstream node, and sending the data packets to the downstream node; when the downstream node receives the data packet, determining the serial number of the data packet and caching the data packet; when the serial number of the data packet is a discontinuous serial number, judging the data packet as a lost data packet; in a preset time sequence period, determining a data packet serial number of a lost data packet meeting a preset condition in the packet loss record queue as a receiving queue expected serial number of the entrance receiving virtual queue; sending a packet loss request to the upstream node through the downstream node based on the receiving queue expected sequence number; and matching the expected data packet corresponding to the expected sequence number of the receiving queue in the local exit entity queue of the upstream node through the upstream node, and retransmitting the expected data packet. According to the invention, the transmission reliability can be improved.

The invention belongs to the technical field of information security, and particularly discloses a data security defense method and system based on data encryption, and the method comprises the steps: carrying out the segmentation conversion processing and hash value calculation of a to-be-protected target data set, carrying out the synchronous iteration shift processing of a hash value, obtaining a plurality of secret key strings, and carrying out the protection of the to-be-protected target data set; the method comprises the following steps of: segmenting and converting serial number conversion data, encrypting the segmented and converted serial number conversion data by using each key string to obtain segmented encrypted data, storing each segmented encrypted data associated hash value into a database, receiving access request data of an access end, extracting an access verification code for mapping conversion, and performing permission verification based on the hash value to obtain the access request data of the access end. If the permission verification is not passed, data access is cut off to ensure data security, and if the permission verification is passed, data reverse processing is performed by using the hash value and the segmented encrypted data to obtain a target data set to be fed back to the access end, so that efficient and reliable data security protection management can be realized, and the security protection performance of the data is effectively improved.

The invention provides an FPGA program loading and updating method and system, and relates to the technical field of FPGA configuration management. The FPGA program loading and updating method comprises the following steps: S1, based on an RS422 physical layer protocol, adopting a self-adaptive block verification algorithm, acquiring a signal-to-noise ratio parameter in real time through a channel quality monitoring module, dynamically adjusting the size of a data packet, and implementing a double-buffer alternate receiving mechanism; and verifying each data block by using cyclic redundancy check and serial number continuity detection, discarding abnormal data packets with bit error rates exceeding the limit, and generating a data block set passing verification. Through combination of an adaptive block check algorithm and channel quality dynamic monitoring, real-time optimization and adjustment of the size of a data packet in a transmission process are realized, transmission requirements in different channel environments are effectively adapted, the data retransmission probability is reduced, and through cooperative application of a double-buffer alternate receiving mechanism, cyclic redundancy check and a serial number tracking technology, the transmission efficiency is improved. And continuity and integrity of data receiving are ensured.

Disclosed are a method and apparatus for identifying peripheral configuration of server, a method and apparatus for laying out peripheral silkscreen, and a server. The method includes: determining a PCIE external interface of each central processing unit on the basis of configuration requirement information of a server to be identified; determining, in sequence according to a level state of each peripheral ID signal transmitted by each PCIE external interface, a peripheral type that is capable of being configured for a peripheral bandwidth corresponding to the peripheral ID signal, allocating corresponding serial numbers to peripherals of different peripheral types, generating a peripheral silkscreen including all peripheral sequences managed by the server to be identified; sending the peripheral silkscreen to a basic input output system and / or a baseboard management controller, and allowing the basic input output system and / or the baseboard management controller to unify respective default silkscreen into the peripheral silkscreen.

The invention relates to a data packet transmission method and device, computer equipment, a computer readable storage medium and a computer program product. The method is applied to a receiver and comprises the steps that under the condition that configuration information of the receiver supports a custom extension header, a first data packet in a sending window is acquired through a transmission channel, and the first data packet carries a serial number and the custom extension header; the user-defined extension head comprises a step length; and under the condition that an out-of-order data packet is received, writing the out-of-order data packet into the corresponding first storage position according to the serial number of the out-of-order data packet, the serial number of the first data packet, the step length and the length of the custom extension head, and returning a confirmation signal of the out-of-order data packet through the transmission channel. By adopting the method, the transmission efficiency of the out-of-order data packet can be improved.

The invention discloses a multi-agent interaction TOKEN compression strategy method and system based on LLMLINGUA, and belongs to the technical field of artificial intelligence and natural language processing. Aiming at the problems of high communication load and difficulty in semantic recovery caused by high-frequency interaction in a multi-agent system, the invention adopts the following technical scheme: inputting text data, and performing word segmentation and semantic analysis to form a low-dimensional semantic vector; dynamically selecting a compression strategy type according to semantic density and serial number density characteristics; the LLMlingua module is used for carrying out depth coding to generate a low-dimensional semantic identifier; storing the identifier in a dynamic reference library and distributing a unique reference code; reference codes and context information are transmitted among the intelligent agents; self-adaptive grouping is achieved through cosine similarity calculation, similar group debate is skipped, and debate between different groups is triggered; the modules are integrated to a multi-agent system. According to the method, the communication load and calculation overhead are remarkably reduced, semantic high-fidelity restoration is guaranteed, and the system response efficiency is improved.

The invention discloses a control system and method for an automatic beer production line, relates to the technical field of automatic control, is used for solving the problems that state judgment is lagged and abnormal trend is difficult to identify in time, identifies electronic tags of key equipment through an RFID reader-writer, imports models and serial numbers into a database, and automatically associates operation parameters. The distributed sensors collect temperature, pressure, flow and vibration data in real time, the analysis unit calculates the operation deviation and the health degree, a multi-condition control strategy is configured through the programmable logic controller based on the health degree, a time window and a task priority algorithm are combined, real-time data and historical data are compared to recognize abnormity, and the real-time data and the historical data are analyzed. And a fuzzy control algorithm is fused to generate an adjustment instruction, the equipment state is automatically adjusted, time sequence modeling is utilized to analyze whole-process data, a start-stop strategy is formulated, energy distribution and process optimization are performed, and intelligent scheduling and self-adaptive optimization of the beer production line are realized.

The invention discloses a horizontal five-axis turning and milling composite center with a self-adaptive matching system. The horizontal five-axis turning and milling composite center comprises a tool turret, a boring tool mechanism, a tool changing area and a control system. A radio frequency identification reading device is arranged in a tool changing area of the tool turret and the boring tool mechanism, and an RFID chip tag is attached to the outer surface of each tool and used for storing tool serial numbers, specifications and length compensation parameters. And the control system realizes self-adaptive matching and sequential error correction of the cutter and the working procedure through radio frequency identification. The tool changing area is provided with a visual monitoring assembly which comprises a plurality of sets of industrial cameras, an adjustable light source and a structured light stripe illumination module and is used for detecting the clamping posture, the abrasion state and the type of a tool. The system has self-learning and digital twinning simulation functions, and can simulate the motion trail of the cutter and predict the interference risk before the cutter is changed. According to the method, integrated control over automatic tool recognition, posture correction, abrasion detection and path prediction is achieved, and the tool changing precision, the operation stability and the automation level of the horizontal five-axis turning and milling composite center are remarkably improved.

The embodiment of the invention provides a data retransmission method, device and system. According to the embodiment of the invention, retransmission is carried out on a physical layer based on a data slice, the data slice comprises a code block carried by at least one FEC code word, and a corresponding serial number is allocated to each data slice in data. A sending device can store sent data slices and corresponding serial numbers in a buffer area while sending data. And after receiving the data, the receiving equipment distributes a corresponding serial number for each data slice according to the same way as the sending equipment. And furthermore, the receiving equipment sends a retransmission request carrying the serial number corresponding to the data slice after finding the uncorrectable error, and the sending equipment extracts the corresponding data slice from the buffer area according to the retransmission request and starts retransmission. It can be seen that the number of code blocks borne by the data slices is small, and compared with message-based retransmission, retransmission based on the data slices is more beneficial to reducing the transmission delay of retransmission and reducing the space of a buffer area.

The invention relates to the technical field of data center remote operation, and discloses a data center remote operation method and system based on collection gateway analysis, and the method comprises the steps: obtaining gateway resource data and data flow priority attributes; quantifying according to the resource data to obtain a cache length; when the cache length is greater than a length threshold value, processing by adopting a dynamic load balancing algorithm to obtain a migration data stream; analyzing according to the data stream to obtain a timestamp and a serial number; measuring according to the timestamp and the serial number to obtain transmission delay and packet loss rate; performing evaluation according to the transmission time delay and the packet loss rate, and performing link dynamic switching to obtain a backup transmission path when an evaluation result is a main link fault; according to the backup transmission path, adopting a distributed routing protocol to calculate and obtain a data transmission path; monitoring according to the data transmission path to obtain monitoring data; predicting according to the monitoring data to obtain an adjustment result; and performing optimization according to an adjustment result, and dynamically switching the main link and the standby link to perform data transmission. The method can solve the problem of low overall data transmission efficiency.

The invention discloses a multi-language dynamic switching system and method of embedded equipment, and relates to the technical field of human-machine interfaces and embedded systems.The method comprises the steps that source codes in an HMI program are traversed through a character extraction module to extract all character strings; eliminating repeated items, numbering the character strings, and outputting a database file and a replacement array; substituting the serial number into the source code file again by using the substitution array to replace the character string at the corresponding position; outputting the translated database file as a C language source code, compiling the C language source code into a dictionary generation module project, generating an executable file, and outputting the dictionary file to an HMI running directory after the device is started; after the HMI program is started, the dictionary is read into different dictionary arrays according to blocks, and character strings at corresponding positions in the dictionary arrays are extracted after a page sends a request. The method has the advantages of being lower in maintenance difficulty, more efficient in resource utilization, shorter in indexing time, better in system robustness and the like.

The invention provides an attack defense method and device which are applied to network equipment, in the method, after the network equipment receives a first control message comprising a first serial number, whether the first control message is a pre-legal message or not is determined according to a first flow identifier and the state of the first control message, and then the first control message is sent to the network equipment; and if it is determined that the first control message is a pre-legal message, determining whether the pre-legal message is a legal message according to the first flow identifier and the first serial number. Therefore, the network equipment can perform'two-stage judgment 'on the received control message to analyze whether the control message is a legal message or not, and discards the control message once determining that the control message is not a pre-legal message or a legal message, so as to realize accurate identification of an attack message of a stateful protocol, and improve the identification accuracy of the attack message of the stateful protocol. Therefore, the attacks of stateful protocols are effectively defended.