73 results about "Secure communication system" patented technology

The invention relates to a self-adaptive information negotiation method applicable to a continuous variable quantum key distribution system, which comprises the following steps of: estimating an optimal code rate that an LDPC (Low Density Parity Check) code should reach under a current quantum channel, converting an initial code rate into the optimal code rate by a receiver, and obtaining a low-reliability bit number l which needs to be disclosed in conversion calculation, the method comprises the following steps of: decoding an LLR (Local Library Ratio) by using Bob, sending the LLR to Alice through a classic channel in combination with an encryption technology, sorting absolute values of the LLR by Alice in a decoding iteration process, selecting l bit positions with low reliability, sending the bit positions to Bob, determining a bit value by Bob according to the bit positions with low reliability sent by Alice, and feeding back and sending the bit value to Alice, and correcting the LLR value by Alice according to bit information sent by Bob. According to the method disclosed by the invention, the code rate of the LDPC code can be flexibly adjusted along with the change of the state of the time-varying channel, and the negotiation efficiency is improved, so that the key rate of the system is improved. The method is excellent in performance in a time-varying channel environment, negotiation efficiency under a low signal-to-noise ratio condition can be remarkably improved, and an efficient and reliable information negotiation scheme is provided for practical application of a quantum secret communication system.

The invention discloses an implementation method of a sub-connection active STAR-RIS assisted secure communication system. A base station, a sub-connection active STAR-RIS, a legal user and an eavesdropping user are included. According to the invention, M units of STAR-RIS are grouped into L sub-arrays, and an amplifier is shared to reduce power consumption and cost; with maximization of system secrecy energy efficiency as a target, base station beam forming, STAR-RIS reflection / transmission coefficients and amplifier amplification coefficients are jointly optimized; and solving the non-convex optimization problem by adopting an efficient algorithm based on block coordinate descent. According to the invention, the hardware overhead and the system power consumption are effectively reduced through the sub-connection structure, meanwhile, the secure transmission efficiency of the system is remarkably improved through joint optimization, multiplicative fading is overcome, and an efficient and reliable solution can be provided for 6G secure communication.

The invention belongs to the technical field of heterogeneous communication network security, and discloses a heterogeneous communication network physical layer security resource joint allocation method, system, equipment and medium based on multi-hop attention hypergraph convolution, and the method comprises the following steps: updating a node feature matrix to define a propagation operator of hypergraph convolution, and then according to the hyperedge type and the propagation operator, determining the hyperedge type according to the hyperedge type and the propagation operator; updating the multi-hop node feature matrix to carry out attention aggregation to obtain final node embedding, embedding the final node of any legal user node into an input multi-head task, distributing a base station access decision by multiple heads, and calculating the transmitting power and beam forming vector of a base station selected by the base station access decision to any legal user, and finally, based on a secrecy rate optimization problem, taking a negative value of the total secrecy rate as a loss function to guide physical layer security resource joint allocation. The system, the equipment and the medium are used for implementing the method. According to the invention, the physical layer security performance of the secret communication system is effectively improved.

The invention relates to communication security, in particular to a security communication system and method based on a quantum SIM (Subscriber Identity Module) card, and a terminal layer, which are used for generating a quantum random number as a key entropy source, performing identity authentication, encrypting and decrypting data and monitoring eavesdropping behaviors; the network layer is used for realizing key relaying, carrying out protocol conversion and achieving cross-network interconnection; the platform layer is used for performing identity authentication, generating a secret key and implementing security monitoring; according to the technical scheme provided by the invention, the defects that the user identity information is easy to leak, the secret key is easy to crack and an active eavesdropping detection mechanism is lacked in the prior art can be effectively overcome.

The invention relates to a secure communication system and method, which realizes data secure transmission through a direct and / or indirect communication mode between an intelligent device and a background server, and can realize device activation by utilizing the data secure transmission so as to realize background management and monitoring of the device and effectively prevent the device from being counterfeited, stolen and the like. And meanwhile, statistics of the number of customers is facilitated, the state of the intelligent equipment is determined, the user is reminded to carry out maintenance / abnormity reminding on the equipment, and the use experience of the user is improved.

The invention relates to a laser chaotic secret communication system based on coherent pumping phase conjugation, which belongs to the technical field of laser communication and comprises a signal transmitting module, an optical fiber link module, a conjugate transpose module and a signal receiving module. The signal transmitting module generates and modulates a chaotic carrier optical signal, and data encryption is realized through phase modulation; the optical fiber link module is used for long-distance signal transmission; the conjugate transpose module adopts an optical comb to generate coherent pump light, and generates phase conjugate waves through four-wave mixing to realize compensation of dispersion and nonlinear distortion in an optical fiber link; and the signal receiving module recovers original data through chaotic synchronization, coherent detection and digital signal processing. The phase locking characteristic of coherent pumping is utilized, the phase noise influence in a traditional pumping system is reduced, the stability of the system is improved, the anti-interference performance of chaotic secret communication and the transmission quality of the system are improved, and a feasible scheme is provided for achieving high-fidelity and high-safety long-distance optical communication.

A secure communication system according to the present disclosure includes a digital license plate installed on a vehicle and a server wirelessly connected to the digital license plate. The server includes one or more server processors and a non-transitory computer-readable server storage medium storing with one or more programmed instructions which, when executed by one or more server processors, cause the server processors to perform: receiving an image and a request to display the image at the digital license plate, verifying whether the image is digitally signed by an authorized party, refusing the request if the image is not digitally signed by the authorized party, and requiring the digital license plate to be unable to display the image.

The invention discloses a method for realizing joint covert communication and secret communication, which belongs to the technical field of wireless communication and comprises the following steps of: constructing a joint covert communication and secret communication system in a D2D (Device-to-Device) and cellular network scene; in the system, the detection performance of a base station (BS) and the secure transmission performance of confidential information of the base station in a cellular communication mode and a D2D communication mode are analyzed, and the secure transmission performance of the base station in the cellular communication mode and the D2D communication mode is optimized. The method comprises the following steps: firstly, in a D2D communication mode, maximizing the confidential transmission rate at a BS (Base Station) in each mode, and secondly, carrying out covert communication capability analysis on user equipment in a D2D communication mode and a forwarding party of the base station, namely obtaining the covert transmission rate of the user equipment and optimizing the transmission rate, and finally obtaining the optimal signal transmitting power of the user equipment of the forwarding party.

This invention provides a time-phase-based quantum lidar, which utilizes CMOS-compatible silicon-based optoelectronic integration technology to fabricate the transmitting and receiving chips. The advantages of chip-based integration include small size, light weight, and low power consumption, making it more practical for applications. The core chip for both quantum lidar and quantum secure communication systems, fabricated using integration technology, offers advantages such as small size, high precision, high speed, and low power consumption. This chip can be used for both quantum lidar and quantum secure communication.

The invention discloses an aluminum oxide zinc-based solar blind photoelectric detector and a preparation method and application thereof, and belongs to the technical field of photoelectric detectors. Comprising a substrate layer, an N-type semiconductor layer, a P-type semiconductor layer and a top electrode layer, the N-type semiconductor layer is arranged on the substrate layer, the P-type semiconductor layer is arranged on the N-type semiconductor layer, and the top electrode layer is arranged on the P-type semiconductor layer. The preparation method of the aluminum oxide zinc-based solar blind photoelectric detector comprises the following steps: cleaning indium tin oxide to obtain a bottom electrode; a metal aluminum target and a metal zinc target are co-sputtered on the bottom electrode through pulse magnetron in an argon oxygen environment to obtain an aluminum zinc oxide film; a metal copper target is sputtered on the aluminum zinc oxide film through pulse magnetron sputtering in an argon oxygen environment to obtain a copper oxide film; and the silver target is subjected to direct-current magnetron sputtering to obtain a silver top electrode. The preparation method is simple, the film stability is high, and later integration and application of the photoelectric detector are facilitated. The photoelectric detector is fast in response speed and high in responsivity, and shows huge potential as a secure communication system optical receiver using international Morse codes.

The invention provides a vehicle-mounted lightweight security communication system and method based on a cloud quantum key pool, and relates to the field of Internet of Vehicles information security. The method comprises the following steps: presetting the same root key in a hardware security module of a cloud terminal and a hardware security module of a vehicle-mounted terminal, obtaining a key application request of a quantum session of the vehicle-mounted terminal, and distributing a quantum session key of the communication from a cloud quantum key pool; based on the root key, encrypting a quantum session key of the communication to obtain a quantum key data packet and transmitting the quantum key data packet to the vehicle-mounted terminal; and analyzing a session key based on the quantum key data packet in the hardware security module, and encrypting the sensitive data by using the session key through a hardware accelerated symmetric encryption algorithm to obtain encrypted vehicle-mounted sensitive data, and decrypting and storing the encrypted vehicle-mounted sensitive data. The method is used in the communication process of the vehicle-mounted terminal and the cloud terminal, and solves the technical problem that the QKD is limited by a special optical fiber or precise sight distance free space optical communication in the mobile vehicle scene application.

This invention discloses a RIS-assisted secure satellite-to-ground communication method under interference, belonging to the field of secure satellite-to-ground communication. The invention is used in a RIS-assisted secure satellite-to-ground communication system, including a satellite transmitter, a RIS, a UAV, a receiver, and multiple EVEs. The UAV is used to transmit harmful interference signals. With maximizing the secure rate as the objective, and constrained by satellite transmit power constraint CR1 and RIS constant modulus constraint CR2, a secure communication system optimization problem is constructed. By using maximizing the secure rate as the optimization objective, secure communication is ensured even with the worst-case receiver. The satellite transmit power constraint CR1 ensures effective transmission by the signal transmitter, and the RIS constant modulus constraint CR2 ensures signal reflection. The RIS constant modulus constraint CR2 and the objective function are deconvexized, and the deconvexized secure communication system optimization problem is jointly optimized to obtain the maximized secure rate, ensuring reliable and secure communication of the multi-user secure communication system even under noise uncertainty.

The invention discloses a real-time confidential optical fiber transmission system and method. The system is provided with a chaotic AI model, a real-time chaotic encryption and decryption module, a synchronous control module and other key function modules. The method comprises the following steps: firstly, training an LSTM model, optimizing and deploying a chaos AI model, and encrypting transmission information at a transmitting end; performing up-sampling and pulse forming on the encrypted signal, compressing the signal frequency band width, performing normalization and quantization, and converting the signal into an analog signal through a DAC (Digital-to-Analog Converter); then, injecting into an electro-optical modulator, converting into an optical signal, and transmitting in an optical fiber transmission link; a photoelectric detection module is used at a receiving end to convert an optical signal into an electric signal, and after the electric signal is collected by an ADC, the electric signal is subtracted from the output of a local chaotic AI model of the receiving end to complete decryption; and finally, carrying out LMS equalization on a decryption result, and restoring an original signal. According to the invention, the problem of difficulty in chaos synchronization of the transmitting and receiving ends of the traditional chaos secure communication system is solved, and high-speed long-distance real-time chaos secure communication can be realized.

The application provides a kind of identity authentication method and system based on blockchain, comprising constructing the distributed two-way authentication and secure communication system of fusion PKI center node and blockchain consensus node;Identity information is configured according to user role;All identity information is stored in a decentralized manner using blockchain technology, and the key summary of identity information is stored on chain instead of original data;Client, server start two-way authentication process according to the trusted information stored on chain, and complete the negotiation and generation of session key;Client, server use the generated session key to perform symmetric encryption and decryption processing on the transmission content.The application effectively prevents the risk of personnel rule violation, data tampering and other risks through strict identity verification and operation traceability, and users can independently manage identity authorization range and use scenarios, thereby completely changing the situation that users passively accept information management and control under the traditional system.

The invention relates to a perception auxiliary safety communication method of a movable antenna auxiliary safety communication system, and belongs to the field of wireless communication. The method comprises the following steps: in an eavesdropper sensing stage, a base station adjusts the positions of a transmitting movable antenna and a receiving movable antenna, transmits L sensing beams and collects all echo signals to obtain an estimated value of a space arrival angle of an eavesdropper; in the secure communication stage, the range of the eavesdropper is obtained based on the sensing stage, a robust beam forming vector transmitted by a base station is designed, and the transmission security rate of a legal user and the eavesdropping rate of the eavesdropper are determined; establishing a two-stage joint optimization problem to maximize the transmission security rate of the legal user under the worst condition and meet the joint optimization problem of perception constraint; and solving the established joint optimization problem to realize safe communication of the legal users. According to the invention, the joint optimization of the position of the movable antenna and the safe beamforming is realized, and the safety and robustness of the perception auxiliary communication system are improved.

The present application relates to the field of traffic communication, specifically to a secure communication system in traffic control network, including three modules of identity authentication, trust evaluation and communication encryption. In the communication node access of traffic control network, the asymmetric encryption and symmetric encryption double channels are used for parallel verification, and the initial channel is established to transmit non-critical data after being legal. The trust evaluation module fuses non-critical data, link delay and retransmission times, combines historical variance confidence index, and outputs communication trust score through model calculation to determine the node as encryption state or constraint state. In the encryption state, the encryption channel is established to transmit critical data in the signal switching window by using one-time session key; in the constraint state, the state snapshot is transmitted in time, and if it is continuously untrusted, the channel is closed, and the historical characteristics are called to accelerate the verification when accessing again. The system realizes the safe transmission of critical data and the efficient exchange of non-critical data, and improves the security and real-time performance of traffic control network.

A method, including generating a full trust group of entities, each entity of the full trust group performs at least one function of issuing a certificate, revoking the certificate, and verifying the certificate based on a digital license plate, generating a limited trust group of entities, each entity of the limited trust group performs at least one function of issuing a provisioning ticket, issuing a manufacturing receipt, verifying a provisioning ticket, provisioning a receipt, and operating the digital license plate, and provisioning the digital license plate based on at least one function from the full trust group and at least one function from the limited trust group.

The invention belongs to the technical field of chaotic circuits, and discloses a sine nonlinear characteristic-based third-order circuit system, which comprises a sine nonlinear function circuit and a third-order linear differential equation circuit, the input end of the sine nonlinear function circuit is connected with the x output end of the third-order linear differential equation circuit, and the output end of the sine nonlinear function circuit is connected with the x output end of the third-order linear differential equation circuit. The output end is connected with one input end of the x integrator of the third-order linear differential equation circuit; the sine nonlinear function circuit is composed of a first operational amplifier A1, resistors R1 to R16 and diodes D1 to D6, and the output and the input of the sine nonlinear function circuit are in a sine nonlinear function relationship; the third-order linear differential equation circuit forms three anti-phase addition integrators by three anti-phase operational amplifiers, three capacitors and seven resistors, and the sine nonlinear function circuit provides nonlinear signals to generate three Chua's chaotic signal outputs of the sine nonlinear third-order Chua's circuit; according to the invention, various chaotic line systems and chaotic secret communication systems can be formed.

This invention discloses a chaotic synchronization secure communication system and method using mutually injected semiconductor ring lasers. The system includes two mutually injected semiconductor ring lasers, a bidirectional optical injection channel, a cross-feedback module, and a chaotic modulation and demodulation unit. Three modes are achieved through parameter matching: same-mode real-time synchronization, different-mode real-time synchronization, and different-mode delayed synchronization. Same-mode real-time synchronization features a wide high-quality parameter range and low latency, while different-mode delayed synchronization exhibits optimal robustness to parameter mismatch, frequency detuning, and current mismatch. The system can achieve secure communication over a long distance of 120 km, maintaining stable synchronization even under noise and process mismatch conditions, making it suitable for fiber-optic chaotic secure communication scenarios.

The invention discloses a port Internet of Things secure communication system based on quantum key distribution, and the system comprises quantum key distribution equipment which is used for generating and distributing quantum keys; the Internet of Things devices are distributed in all areas of the port and used for collecting and transmitting port operation related data; the control center is used for managing and controlling the whole system; and the communication network comprises a quantum channel and a classic channel, the quantum channel is used for transmitting the quantum key, and the classic channel is used for transmitting the encrypted data and control information. By combining the quantum key distribution technology with the port Internet of Things, a high-security and high-reliability solution is provided for port Internet of Things communication, and strict requirements of ports on communication security under ever-increasing service requirements are met.

The invention provides an encryption communication method and device, equipment, a medium and a product, and relates to the technical field of encryption communication, and the encryption communication method comprises the steps: obtaining an encryption key in a local preset key space based on a local preset key start identifier, and carrying out one-time pad encryption on media stream data; the media stream data subjected to one-time pad encryption is sent to a media service device, and the media service device is configured to obtain a corresponding calling party preset key based on a key start identifier from a calling party terminal and decrypt the media stream data, and to decrypt the media stream data based on a key start identifier obtained from a called party terminal and decrypt the media stream data based on a key start identifier obtained from a called party terminal; and obtaining a corresponding preset key of the called party, performing one-time encryption on the decrypted media stream data again, and sending the encrypted media stream data to the terminal of the called party. According to the embodiment of the invention, the security degree of VoIP communication is improved, the packet loss rate is reduced, and a complete safe communication system capable of landing is formed.

The application discloses a key extraction time synchronization method and system based on an atmospheric turbulence random channel, belongs to the technical field of laser communication and information security, and realizes high-precision time synchronization and dynamic key generation by bidirectional link delay calculation, combination of temperature compensation crystal oscillator compensation and global time reference, adoption of a time division duplex frame structure and an adaptive quantization threshold algorithm, effectively solves the problems of random changes of channel characteristics caused by atmospheric turbulence and clock drift, and can improve synchronization precision and key generation rate, and is suitable for a secure communication system in a complex atmospheric environment.

Information is efficiently communicated while high secrecy is maintained in a network in which eavesdropping, error, and falsification occur. A control device of a communication network including a plurality of nodes and links each connecting two of the nodes includes a first instruction unit 110 configured to instruct a source node among the plurality of nodes whether to perform MRD encoding when the source node performs transmission, a random number transmission unit 120 configured to transmit a random number in accordance with a maximum number of links susceptible to eavesdropping among the links to the source node in a case in which the source node is instructed to perform MRD encoding by the first instruction unit, and a second instruction unit 130 configured to instruct each of the plurality of nodes whether to perform OTP encryption when the node performs transmission to another node.

This invention discloses a secure communication method and system for power distributed terminals based on post-quantum cryptography. With the development of quantum computing technology, traditional secure communication mechanisms based on elliptic curve cryptography face potential vulnerabilities. In existing secure communication systems for power distributed terminals, the terminal device and the secure access gateway typically use the SM2 elliptic curve cryptography algorithm for session key negotiation, which poses security risks in a quantum computing environment. This invention replaces the SM2 algorithm with a lattice-based post-quantum cryptography algorithm for session key negotiation and doubles the key length of the SM4 algorithm used for symmetric encryption services. While maintaining the original power communication system architecture and business processes, this invention achieves a quantum security upgrade for the power distributed terminal communication system, improving the system's long-term security in future quantum computing environments.

The invention belongs to the technical field of chaotic circuits, and discloses a sine nonlinear signal processing-oriented multi-order circuit system, which comprises a sine nonlinear function circuit, a fourth-order linear differential equation circuit and a fifth-order linear differential equation circuit, and is characterized in that the sine nonlinear function circuit consists of an operational amplifier A1, resistors R1 to R16 and diodes D1 to D6; the output and the input are in a sine nonlinear function relationship; the fourth-order and fifth-order linear differential equation circuit consists of an inverting operational amplifier, a capacitor and a resistor, and is used for generating a plurality of Chua's chaotic signal outputs of the sine nonlinear fourth-order and fifth-order Chua's circuit; the circuit can form various chaotic circuit systems and chaotic secret communication systems.

The invention discloses a key extraction time synchronization method and system based on an atmospheric turbulence random channel, belongs to the technical field of laser communication and information security, and aims at realizing key extraction time synchronization through bidirectional link delay calculation, combination of temperature compensation crystal oscillator compensation and global time reference and adoption of a time division duplex frame structure and a self-adaptive quantization threshold algorithm. High-precision time synchronization and dynamic key generation are realized, the problems of random change of channel characteristics and clock drift caused by atmospheric turbulence are effectively solved, the synchronization precision and the key generation rate can be improved, and the method is suitable for a secret communication system in a complex atmospheric environment.

A secure communication system allows instructions to be selected and communicated to remote users in a manner that obviates voice transmission includes a transmitter and at least one receiver. The transmitter includes an input that receives an instruction signal from an external system, a transmitter unit that transmits wireless signals, and a first microcontroller coupled to the input and to the transmitter unit. The first microcontroller provides the transmitter unit with a selection signal to wirelessly transmit that corresponds to the received instruction signal. A first receiving unit of the receiver wirelessly receives the selection signal. The first memory of the receiver contains a plurality of stored instructions. An output device of the receiver produces a human-perceptible output of at least one of the stored instructions. The second microcontroller determines the stored instruction in the first memory to be reproduced by the output device based on the received signal.

Method of creating secure tunnel(s), a router node (RN) implementing same and a network comprising RNs is provided. Method comprises connecting a RN to the network. RN comprises bearer interfaces, each having a VRF module; receiving, from neighbouring nodes (NNs), loopback address(es) for bearer interface(s) in the NNs, and detecting, using the RN, routing prefix(es) associated with a tunnel within the loopback address(es). In response using the RN to: build a routing table (RT) comprising loopback address(es) for a bearer interface of the same type in one of the NNs; extract, from the RT, an IP address per tunnel being created; and set each extracted IP address as the destination address for each tunnel. Method comprises establishing a tunnel to each NN, by selecting a bearer interface for each NN; learning the set destination addresses and building the tunnel to each NN using the learnt destination addresses.