123 results about "Chaotic systems" patented technology

The invention provides an inter-micro-service dynamic secure communication method and device based on chaos cryptography. The method comprises the steps that a service provider instance registers a public key and chaos initial parameters to a service registration center; before calling, the service consumer instance acquires a public key and a chaos initial parameter of a target service provider instance from a service registration center; the service consumer instance performs key negotiation with the acquired public key by using a private key of the service consumer instance to determine a shared key; performing key derivation on the shared key and the chaotic initial parameter to generate an initial key; respectively using the initial keys to initialize the chaotic system so as to generate synchronous encryption key streams; and the two communication parties perform real-time stream encryption and decryption on the communication data between the micro-services by using the encryption key stream. The unpredictability of a chaotic system and modern cryptography can be combined, and a micro-service design mode is deeply integrated, so that a lightweight and high-security communication security mechanism which does not need to share a key in advance and can be adaptive to dynamic change of service is realized.

The invention relates to the field of information security and random number generation, and discloses a pseudo-random sequence generation system based on a four-dimensional hyperchaotic system, and the system comprises a chaotic signal generation module which is used for generating a chaotic state track composed of four state variables; the numerical solution module is used for carrying out multi-step numerical integral iteration on the state variable; the signal optimization module is used for performing cross recombination, disturbance arrangement and nonlinear quantization on the state variables; the control management module is used for controlling initialization, operation time sequence and state synchronization of each module; and the output interface module is used for outputting the pseudorandom sequence. According to the method, a four-dimensional hyper-chaotic system and a double positive Lyapunov index structure are adopted as a core dynamics basis, the technical effect of improving the unpredictability of the pseudo-random sequence and the trajectory complexity is achieved, and the potential safety hazards that the dynamic behavior is single, the dependence on initial conditions is too weak and the like are effectively overcome.

The invention discloses a multi-modal industrial defect detection method based on a chaotic neural network, and the method comprises the steps: obtaining and aligning industrial defect data of multiple modals, carrying out the feature extraction and fusion through a multi-branch neural network, and generating a unified defect feature vector; taking the feature vector as an initial condition of a preset high-dimensional chaotic system, and generating a binary hash code which is extremely sensitive to the initial condition through iterative operation; in a pre-constructed defect instance library in which historical defect hash codes and associated production data thereof are stored, rapid retrieval is performed by using the hash codes to obtain historical instances similar to the current defect, and the associated production data thereof are aggregated to perform automatic root cause analysis; according to the method, the sensitivity of a chaotic system to an initial value is utilized to amplify feature tiny differences, so that the precision and efficiency of nonlinear feature retrieval are remarkably improved, seamless integration from efficient retrieval to intelligent root cause analysis is realized, and a data closed loop from defect detection to process optimization is formed.

This invention discloses a phased anomaly detection method for ultra-large-scale industrial software supply chains based on graph neural networks. It divides the software anomaly detection task into two stages. In the rapid contamination stage, a simple model is used to quickly learn global anomaly patterns and filter out potential anomaly nodes and regions. In the precise detection stage, a more complex model is used to detect anomaly nodes. Furthermore, this invention defines the "disorder level" of nodes on the graph based on the Lyapunov coefficients in chaos theory and utilizes the "defect" of rapid oversmoothing in graph neural networks to rapidly propagate the behavioral patterns of anomaly nodes on the graph, simulating the propagation process of the entire chaotic system. In this way, this invention can quickly learn the global node anomaly patterns and quickly and accurately filter out candidate anomaly nodes and regions.

The invention discloses a key negotiation synchronization method and system for a complex satellite network, and the core of the key negotiation synchronization method is that chaotic system synchronization and neural network mutual learning synchronization are organically fused, and a dual synchronization architecture is constructed; specifically, a local field of each hidden unit of the TPM is transformed and then input into improved Logistic chaotic mapping, and then output bits of the hidden units are determined after output of the chaotic mapping is transformed through an arcsine function, so that a bidirectional feedback coupling relation is established between state updating of a neural network and evolution of a chaotic system. According to the design, the fast synchronization characteristic of the chaotic system and the mutual learning capability of the neural network are mutually promoted, the synchronization convergence speed of key negotiation is remarkably increased, meanwhile, the attack resistance of the system is enhanced by utilizing the unpredictability of chaos, and finally, on the premise that the safety is guaranteed, the key negotiation efficiency is improved. And the efficiency and the reliability of the key negotiation process of the complex satellite network are effectively improved.

The present application discloses a method, device, and medium for controlling a drone based on a random key stream, and relates to the field of aircraft control technology. The method includes: presetting a chaotic initial value for the main chaotic system of the encryption end; selecting a switching strategy based on the current state component of the main chaotic system to switch the auxiliary chaotic system; generating a random key stream coefficient through a seed random number generator, combining the random key stream coefficient with the chaotic initial value to obtain a private key; obtaining the plaintext of the aircraft measurement data, injecting the plaintext into the chaotic system, and generating ciphertext in combination with the random key stream coefficient; transmitting the ciphertext to the decryption end, synchronizing the private key and the switching strategy at the decryption end, and restoring the plaintext; inputting the restored plaintext into a state feedback controller to generate an anti-saturation control instruction, and the state feedback controller includes a nonlinear compensation function. The present application uses the above method to implement encryption and decryption of the aircraft's measurement data using the chaotic system key stream, extend the private key length, and improve security.

This invention belongs to the field of chaotic optical communication technology and discloses a method, system, and application for estimating the time delay characteristics of a chaotic optical communication system. The chaotic signal generated by the chaotic optical communication system is transmitted from the transmitter to the receiver, and the chaotic signal is captured from the transmission link. After data acquisition, the delay characteristics of the chaotic signal in the chaotic system are directly estimated. A reservoir network is used to establish a model between the chaotic time series and the reconstructed delay series. The functional relationship between the two sequences at the correct delay characteristic parameters is analyzed, and the delay characteristics are estimated by traversing the reconstructed delay, thereby realizing the estimation of the delay characteristics of the chaotic optical communication system. This invention adopts a reservoir network modeling method, which has certain advantages and effectiveness. It can directly estimate the delay characteristic parameters from the chaotic signal of the chaotic optical communication system, further improving computational efficiency and providing a new approach for delay extraction in chaotic optical communication systems.

The application discloses a kind of improved logistic chaotic sequence hybrid measurement matrix construction method.The element of measurement matrix in the application is by the sequence with independent and identically distributed statistical properties generated by a modified logistic chaotic system, after two-level processing, it meets Bernoulli statistical distribution, satisfies the RIP criterion required to be obeyed by measurement matrix of compressive sensing technology, finally, the measurement matrix obtained by sequentially filling according to the toprizi matrix construction rule, with the randomness characteristics of chaotic deterministic system, and the measurement matrix has the advantages of low data amount required to be generated, easy to realize hardware resources etc., and the reconstruction accuracy of signal is better than random Gaussian measurement matrix.

The invention discloses an 8-bit S box construction method based on greedy random adaptive search, which comprises the following steps of: firstly, introducing a nonlinear term power function, a trigonometric function and a logarithmic function to construct a two-dimensional hyper-chaotic system TDHM on the basis of a benchmark test function Himelblau function; secondly, constructing a bijection initial S box based on a random number sequence generated by a two-dimensional hyper-chaotic system TDHM; and finally, respectively carrying out linearity and differential uniformity optimization on the S boxes of which the cryptographic properties do not meet the requirements, setting corresponding cost function values as optimization constraint conditions, selecting an optimized exchange strategy according to corresponding greedy rules, carrying out local search on the S boxes to optimize the linearity and differential uniformity of the S boxes, and carrying out optimization on the S boxes. And the password S box meeting the target condition is constructed. According to the method, the success rate of searching the S box meeting the target requirement is improved, and the average iteration frequency of the algorithm is effectively reduced.

The invention provides a power grid BIM data dynamic layering encryption method based on function disturbance and chaotic mapping. According to the method, geometric information of a power grid BIM model is converted into a mathematical function set through an NURBS parameterization decomposition technology, disturbance parameters are generated through a double-chaos system, and an NURBS function set is encrypted. Local updating and tampering prevention of attribute data are achieved through a dynamic hash tree and an evidence storage technology, and safe storage, dynamic authority control and efficient updating of the BIM data of the power grid project are ensured. Compared with the prior art, the method has the advantages that the problems of encryption and analysis conflict, static key risk and insufficient compatibility caused by a traditional encryption algorithm are solved, dynamic layered encryption of the power grid BIM data is realized, and the security and availability of the data are improved.

The invention relates to the technical field of communication security, in particular to a speech encryption and decryption method based on fractional order chaotic system synchronization, which comprises the following steps of: selecting an m-dimensional fractional order chaotic system as a driving system to generate a chaotic sequence, and performing multiple XOR operations on a preprocessed speech signal and the chaotic sequence to obtain a speech signal; performing indexing and polarity scrambling on the audio signal by using a Logistic mapping sequence to complete encryption; constructing an n-dimensional response system and an error system, and designing a fractional order integral sliding mode controller to realize predefined time synchronization; after the encrypted audio is received, according to a corresponding chaotic sequence generated by a response system, inverse operation is completed for decryption reduction; predefined time synchronization of different fractional order chaotic systems is realized through a fractional order integral sliding mode controller, and high-intensity encryption and decryption are performed on voice data in combination with multiple XOR operations, polarity scrambling and index scrambling, so that the synchronization efficiency and robustness of the system are remarkably improved.

The invention discloses a quantization index modulation steganography method based on chaos assistance, and aims to improve the security and concealment of information hiding. According to the method, a high-complexity pseudo-random sequence is generated by combining a delay coupling Lorentz chaotic system, the pseudo-random sequence is converted into a uniformly-distributed sequence through modular lattice operation, the uniformly-distributed sequence serves as external jitter to be introduced into a lattice quantization process, and therefore safe embedding of messages is achieved. According to the method, high-density embedding can be realized while carrier signal statistical characteristics are kept to effectively resist statistical steganalysis, and the method has relatively good image quality and robustness and is suitable for various types of digital carriers such as images, audios and the like.

The invention discloses a female endocrine metabolism intelligent monitoring method, system, device and medium, a secondary encryption mode combining improved chaotic encryption and AES encryption is adopted, an adaptive parameter adjustment mechanism is introduced into the improved chaotic encryption, chaotic system parameters are dynamically adjusted according to data block characteristics, the key space is expanded, and the encryption efficiency is improved. The encryption complexity is enhanced; and AES encryption, HTTPS protocol transmission and a CRC verification mechanism are combined, so that the security and integrity of data transmission are greatly improved, and the problem of insufficient privacy protection in the prior art is solved.

A predefined time ZNN model design method for solving pseudo-inverse of a time-varying matrix comprises the steps that a pseudo-inverse matrix is solved based on the time-varying matrix, an error function is established, the time-varying matrix is known, and the pseudo-inverse matrix to be solved is unknown; designing a predefined time function based on a high-gain method, and introducing the predefined time function into the ZNN model; aiming at bounded noise interference in a ZNN model solving process, introducing a disturbance estimator comprising a predefined time function, and constructing a subsystem of a neural network model; a Lyapunov function is constructed for stability analysis, and a ZNN model obtained through analysis can effectively suppress noise and solve a pseudo-inverse matrix of a time-varying matrix at predefined time. And applying the predefined time ZNN model to control of the permanent magnet synchronous motor chaotic system. According to the designed predefined time ZNN model, a complex parameter adjustment process is avoided in parameter adjustment. The method has the advantages of high robustness, high calculation precision and high solving speed.

The present application discloses an aircraft control method, device, and medium based on switched chaotic system encryption, which relates to the field of data encryption. The method includes: injecting the plaintext data corresponding to the measurement data emitted by a sensitive device into the output equation of the chaotic system to obtain the corresponding ciphertext data; obtaining the corresponding switching signal based on the chaotic system state variable of the basic judgment model, and switching the currently activated second chaotic system according to the switching signal; sending the ciphertext data to the control component to obtain the plaintext data corresponding to the measurement data; and performing flight control on the aircraft. Taking advantage of the fact that chaotic nonlinear systems are extremely sensitive to initial values, an encryption algorithm based on switched chaotic systems is designed for drone control. According to the designed switching strategy, a switched encryption chaotic system is introduced into the encryption algorithm to make the key stream more random, thereby increasing the security of the aircraft measurement data encryption.

The present invention discloses a hierarchical coordinate reversal encoding method, device, and system based on constellation joint shaping. The method comprises probabilistically shaping an original pseudo-random binary sequence to generate a binary sequence with a non-uniform probability distribution; performing serial-to-parallel conversion on the non-uniform probability distribution binary sequence and mapping it onto a pre-generated three-dimensional constellation; utilizing a key and a four-dimensional multi-phase hyperchaotic system to generate four different chaotic sequences, two of which are used to encrypt subcarriers and symbols, respectively; combining the remaining two chaotic sequences into a new chaotic sequence; and using the new chaotic sequence to perform coordinate reversal on constellation points on the three-dimensional constellation to complete constellation point encryption. The present invention can ensure the security of the communication system while effectively reducing the damage to transmission performance.

The invention discloses a multi-cascade sequence enhanced double-domain signal transmission method and system and a medium, and relates to the technical field of signal processing. The method comprises the following steps: acquiring an original signal to be transmitted and a key initial value; generating a two-dimensional chaotic sequence X and a two-dimensional chaotic sequence Y from the key initial value through a cross chaotic system; performing symbol domain masking on the original signal by using the two-dimensional chaotic sequence X to obtain a symbol domain encrypted signal; performing serial-to-parallel conversion and PAM4 mapping on the symbol domain encryption signal to obtain a mapping signal; the mapping signal is input into an FIFO register for time domain masking, and a time domain encryption signal is obtained; the clock delay of the FIFO register is controlled through the two-dimensional chaos sequence Y; and performing signal transmission on the time domain encrypted signal. According to the invention, the problems that the secret key is fixed and is difficult to update in the traditional scheme are avoided, and collaborative optimization of real-time transmission and security is realized while nanoscale processing delay is ensured.

The invention discloses a chaotic key generation method and system based on discrete exponential memristor coupling and a data encryption method. The chaotic key generation method comprises the following steps: firstly, generating a chaotic system composed of a discrete index memristor, a linear controller and one-dimensional chaotic mapping, setting initial input data of the chaotic system and initial state parameters of the discrete index memristor, and then performing multiple iterations through the chaotic system to obtain a chaotic key; and finally, constructing a chaotic key based on the chaotic sequence of each iteration. The chaotic key generation system comprises a chaotic system and a data processing module, and is used for realizing the chaotic key generation method. The data encryption method comprises the following steps: firstly, generating a chaotic key based on a chaotic key generation method, and then encrypting plaintext data to obtain encrypted data. The chaotic dynamics constructed by the method is rich in behavior and excellent in performance index, and the chaotic key constructed based on the chaotic sequence generated by the chaotic system is high in security and can adapt to different hardware signal requirements.

Aspects discussed herein may relate to methods and techniques for using a multi-step approach to automatically analyze the computer architecture using an iterative process to inject error conditions. After determining an ordered graph indicating possible failure points, the system may then inject one or more error conditions (e.g., increased latency) to determine possible effects and / or points of failure. As a result of this analysis, the system may modify analysis regarding possible error points and / or take remedial actions to avoid failure.

The invention discloses an arbitrary-dimension simplest memristor Hamilton conservative chaotic system and a construction method and application thereof, and belongs to the technical field of information security. According to the system, a voltage difference type three-terminal memristor model is firstly built, then an n-dimensional Hamilton conservative chaotic system general formula is built, the memristor model is introduced into the n-dimensional Hamilton conservative chaotic system general formula, the simplest system is obtained through the steps of element replacement, parameter setting and the like, and multi-scroll expansion can be achieved by introducing a nonlinear function. A system mathematical model is simple, the proportion of nonlinear terms is low, hardware is constructed based on an ARTIX-7 FPGA platform, a 36Q32 format fixed-point number is adopted, resource consumption is low, data throughput is high, and output sequence randomness is high. The system can be applied to the fields of artificial intelligence data enhancement and random signal generation, provides a new path for high-dimensional conservative chaotic system modeling, and is suitable for information security application of resource-limited scenes.

A data multi-protection method relates to the technical field of information security, solves the problems that a traditional encrypted image is easy to be visually identified and pointedly cracked, and a traditional steganography method is insufficient in security and steganography capacity, and comprises the following steps: reading privacy data and a carrier image, and respectively converting the privacy data and the carrier image into two-dimensional matrixes; a carrier image hash value is obtained through an SHA-256 algorithm, a one-dimensional chaotic system is constructed to generate a chaotic sequence, and three sequences are obtained through a mod function limitation range; a final encrypted image is obtained through chaotic sequence scrambling of privacy data, orthogonal moment transformation of a carrier image, data embedding and reverse transformation reconstruction in sequence and through secondary scrambling and diffusion operation. According to the scheme, the algorithm complexity is increased, and the privacy data protection security is improved.

This invention discloses a dual-encryption image protection method based on chaotic mapping and linear congruence, specifically including the following steps: S1: Obtain the image to be encrypted and convert the image into a data sequence; S2: Scramble the image sequence of the data sequence using the AES encryption algorithm to obtain the first sequence to be encrypted; S3: Construct a chaotic system to generate a chaotic sequence and map and encrypt the chaotic sequence to obtain a key sequence; S4: Perform an XOR operation on the first sequence to be encrypted and the key sequence to output the encrypted sequence.

The invention provides a chaotic encryption and control method for an aircraft instruction, and relates to the technical field of information security, and the method comprises the steps: receiving plaintext data of an aircraft control instruction, respectively injecting the plaintext data into state equations of a plurality of chaotic systems, and generating a plurality of paths of key streams; performing internal permutation operation on the multiple paths of key streams by using predefined permutation vectors respectively, and performing external interleaving operation on the multiple paths of key streams subjected to internal permutation by using an interleaving sequence specified by predefined interleaving vectors so as to combine and generate a path of composite key stream; encrypting the plaintext data by using the composite key stream to obtain a ciphertext instruction, and sending the ciphertext instruction to an aircraft control end; and at the control end, decrypting the ciphertext instruction based on a preset permutation vector and an interleaving vector, restoring the plaintext data, and generating an aircraft control signal through an output feedback control algorithm according to the decrypted plaintext data.

The application relates to encryption communication technology, and particularly discloses a construction, dynamic analysis and application method of a six-dimensional memristor hyperchaotic system. The method discovers that the new system has unique dynamic behaviors through a phase diagram, a bifurcation diagram and a Lyapunov exponent spectrum, generates symmetric coexistence cycles, chaos and hyperchaos double-wing attractors which depend on system parameters, shows extremely strong initial value sensitivity, has special symmetric extreme multistability and a memristor initial value enhancement behavior, generates symmetric four-wing attractors by adding a constant controller, shows more complexity and diversity, and finally, simulation is carried out through Multisim, the generated attractor is consistent with a phase diagram obtained through numerical simulation, and the feasibility of the new system is verified. The application has great advantages in encryption security and attack resistance.

This invention discloses a V-OFDM secure transmission method, system, device, and medium based on a dynamic feedback chaotic system. The method constructs a three-dimensional Lorenz chaotic mapping model based on dynamic feedback factors, controls the row and column transformations of the orthogonal DFT matrix, and independently encrypts each vector block. The system, device, and medium are used to implement this method. The method fully utilizes the vector block characteristics of V-OFDM, introducing dynamic row and column permutations of the DFT matrix, resulting in a spherical chaotic state in the encrypted constellation diagram, making it difficult for eavesdroppers to crack. This greatly enhances the system's resistance to signal interception, effectively strengthens the security of the physical layer, and reduces the system's peak-to-average power ratio (PAPR).

The application relates to a chaotic system with a sine feedback control limited time synchronization model, which is mainly applied to limited time synchronization of master-slave non-autonomous chaotic systems, and is characterized in that the limited time synchronization model comprises a master non-autonomous chaotic system, a slave non-autonomous chaotic system and a sine feedback controller; wherein the output end of the master non-autonomous chaotic system is connected with the input end of the sine feedback controller, the output end of the sine feedback controller is connected with the input end of the slave non-autonomous chaotic system, and the output end of the slave non-autonomous chaotic system is connected with the input end of the sine feedback controller. The sine feedback control can make two chaotic systems reach synchronization in the shortest possible limited time. Moreover, no matter how large the input master-slave system state variable is, the sine feedback control can always output a smooth bounded control signal, so that the adverse effect on the slave system due to the too large input of the slave system can be prevented.

The application discloses a transmission method based on Polar code and chaotic CCDM multi-path encryption, which comprises the following steps: (1) converting an original data stream into a relatively short multi-channel parallel data stream after serial-parallel conversion; (2) obtaining a five-dimensional hyperchaotic system by using a five-dimensional chaotic model after the data is converted by serial-parallel conversion; (3) dividing a first group of chaotic sequences into three groups of data; (4) merging the three groups of data, sequentially scrambling subcarriers by using a fifth group of chaotic sequences, performing the last encryption, and finally obtaining safe data after multi-round encryption; (5) at a receiving end, performing demodulation and decryption operations on the encrypted signal by using a process opposite to that of a sending end, decrypting the received information by an ONU with all the keys, and finally obtaining correct information after decryption; the application can optimize constellation probability distribution, improve BER performance, improve security performance, and effectively reduce complexity.

The invention relates to a three-dimensional image encryption method and system based on a four-dimensional hyper-chaotic system and a medium in the technical field of information security. The three-dimensional image encryption method comprises the following steps: mapping all vertexes in V into bytes to obtain an original byte matrix; a four-dimensional hyper-chaotic system is constructed, and a row and column key Kperm and a diffusion key Kdpff are generated. Firstly, scrambling is carried out through the Kperm pair, and then diffusion is carried out through the Kdpff. According to the method, grid vertex coordinates of a three-dimensional image are equivalently mapped into a two-dimensional unsigned integer matrix, on the basis, a designed four-dimensional hyperchaotic system is introduced to respectively generate a row scrambling sequence, a column scrambling sequence and a diffusion mask matrix, and scrambling and XOR diffusion processing is performed on vertex data on a byte level, so that a three-dimensional image is obtained. Therefore, while the encryption security is ensured, the encryption and decryption reversibility is high, and the method can be flexibly expanded under different file formats, different chaotic parameters and different projection strategies, and is suitable for engineering implementation and subsequent optimization.

The invention discloses a construction and implementation method of a hyperbolic tangent fractional order memristor chaotic system. The method comprises the following steps: firstly, designing a fractional order magnetic control memristor model containing a hyperbolic tangent function, and constructing a fractional order memristor chaotic system based on the model; through high-resolution order parameter scanning and in combination with Lyapunov exponent spectrum, bifurcation diagram, phase diagram and complexity analysis, rich dynamic behaviors and high sensitivity of the system under order change are revealed; a difference equation model of the system is obtained through a frequency domain approximation and discretization method, digital modeling is completed on a DSP Builder platform, and hardware description language codes executable by an FPGA are automatically generated; finally, the real-time iterative operation of the system is realized on the FPGA development board, and the physical realizability of the chaotic attractor is verified through the oscilloscope. The invention provides a high-precision and low-power-consumption hardware implementation scheme for the fractional order memristor chaotic system, and is suitable for the information security fields of secret communication, image encryption and the like.

This invention relates to the field of image encryption technology, specifically to an image encryption algorithm based on an enhanced chaotic system, comprising the following steps: S10: Generating a hash value of a color plaintext image using the SHA-256 algorithm, and using this hash value to establish the initial key of the enhanced chaotic system; S20: Iterating a chaotic sequence using the enhanced chaotic system under preset initial conditions, and using this chaotic sequence to establish the image encryption algorithm; S30: Performing a preliminary diffusion scrambling operation on the color plaintext image based on the chaotic matrix; S40: Performing a bidirectional modal diffusion operation on the image after preliminary diffusion scrambling to obtain a ciphertext image; S50: Decrypting the ciphertext image according to the reverse process of image encryption to obtain a decrypted image; This algorithm can resist various image attacks and has good security performance and encryption effect.