156 results about "Keystream" patented technology

The invention discloses an aircraft control method and device based on switching chaotic system encryption and a medium, and relates to the field of data encryption, and the method comprises the steps: injecting plaintext data corresponding to measurement data sent by a sensitive device into an output equation of a chaotic system, and obtaining corresponding ciphertext data; obtaining a corresponding switching signal according to 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 a control component to obtain plaintext data corresponding to the measurement data; and performing flight control on the aircraft. The characteristic that a chaotic nonlinear system is extremely sensitive to an initial value is utilized, and an encryption algorithm based on a switching chaotic system is designed and used for unmanned aerial vehicle control. According to a designed switching strategy, a switching encryption chaotic system is introduced into an encryption algorithm, so that a key stream is more random, and the security of aircraft measurement data encryption is improved.

The invention relates to the technical field of data security, can be applied to business scenes of financial science and technology, medical health and the like, and discloses an encryption processing method, device, equipment and medium based on chaos parameter adjusting.The encryption processing method comprises the steps that a composite chaos signal is generated based on a chaos module, and feedback information is dynamically extracted in combination with a hash function; an error vector is constructed, chaotic module parameters are adjusted, an updated composite chaotic signal is generated, a key stream is generated through quantization, the data block size is determined according to the amplitude of the error vector, block encryption target data is driven through the key stream, and dynamic cooperation of the key stream and the data encryption process is achieved. According to the method, a chaos module, a hash function and a dynamic adjustment mechanism are closely combined, real-time hash value feedback control over dynamic evolution of chaos parameters is achieved, error driving adjustment is introduced in the key stream generation process, the continuity and randomness of key stream entropy values are improved, and the key stream generation efficiency is improved. The problem of low efficiency of hash static application and encryption processing in the prior art is effectively solved.

The invention discloses a coding method and device based on power domain chaotic distribution matching. The method comprises the following steps: acquiring a key initial value and to-be-sent original data; performing chaotic encryption on the key initial value through a Chua's chaotic system to generate a chaotic sequence; carrying out system conversion on the key initial value, and carrying out mapping processing according to a rule to obtain a key stream formed by a QPSK constellation diagram; performing encryption and serial-to-parallel conversion on original data in a binary form by using the chaos sequence, and then performing quadrature phase shift keying (QPSK) mapping to obtain an information stream formed by uniformly distributed QPSK constellation diagrams; respectively carrying out power distribution on the key stream and the information stream, and carrying out constellation diagram superposition on the key stream and the information stream after power distribution to form an encrypted stream of a non-uniformly distributed 16 QAM constellation diagram; and performing translation rotation on each region of the partitioned constellation diagram of the encrypted stream according to a rule, and finally realizing probabilistic shaping to obtain the PS-16QAM constellation diagram encrypted stream. The method can improve the quality of signal transmission.

The invention discloses an image encryption method and device based on a chaotic system and electronic equipment, and relates to privacy computing or other related fields, and the method comprises the steps: converting a target image into a three-channel grayscale image, and converting the three-channel grayscale image into a one-dimensional array; obtaining a first random key stream generated by the new four-dimensional chaotic system, and performing pixel value diffusion on the one-dimensional array; merging the diffused image arrays, generating a scrambling function based on chaotic tent mapping, and scrambling pixel positions of the merged arrays; obtaining a second random key stream, selecting a DNA coding rule, and coding the scrambling array into a DNA sequence; obtaining a third random key stream and selecting a DNA operation rule to perform encryption operation on the DNA sequence; and decoding the encrypted sequence into a decimal system, and combining channels to obtain a target encrypted image. Through the method and the device, the technical problem that the encryption information is easily attacked and cracked due to the fact that the sensitive data encryption method in the related technology is limited to the encryption dimension and the key space is solved.

The invention discloses a data encryption method for multilevel key stream control in an industrial gateway, and particularly relates to the technical field of data encryption and network security. The method comprises the steps of obtaining a session identification code and communication context information; generating a first-level basic key based on the session identification code, and generating a multi-level key stream control matrix in combination with communication context information and a multi-source dynamic random factor; according to the hierarchical relationship of the matrix, key stream sequences of corresponding levels are distributed to data packets of different priorities, and the key stream sequences are switched or combined in real time according to data packet types, transmission paths and security policies in the encryption process, and time fragmentation processing and disturbance coding are executed; the encrypted data packet is sent through a multi-protocol forwarding module of the industrial gateway, and the receiving end carries out decryption by using the key stream control matrix; according to the invention, dynamic generation, hierarchical calling and safe switching of the key stream can be realized, and the data confidentiality, integrity and anti-attack capability of the industrial gateway in a complex network environment are remarkably improved.

The invention discloses a signal transmission method and device based on orthogonal matrix precoding. The method comprises the steps that four chaotic sequences X, Y, Z and W are generated through a four-dimensional chaotic model according to a key initial value; performing bit interleaving on the original data by using X and W to obtain first data; performing serial-to-parallel conversion and QPSK mapping to obtain a mapping signal; scrambling the subcarriers and symbols of the mapping signals by using Y and Z to obtain encrypted data; carrying out IFFT (Inverse Fast Fourier Transform) on the encrypted data, adding a cyclic prefix, and carrying out parallel-serial conversion to obtain an encrypted data stream; performing binary conversion and serial-parallel conversion on the key initial value to obtain a square matrix K, and shaping the square matrix K by using a public key to obtain a key matrix; performing serial-to-parallel conversion, QPSK mapping, IFFT, cyclic prefix addition and parallel-to-serial conversion on the key matrix to obtain a key stream; and performing linear superposition on the encrypted data stream and the key stream through power distribution to obtain a power division multiplexing orthogonal frequency division multiplexing signal, and transmitting the power division multiplexing orthogonal frequency division multiplexing signal.

The present invention discloses a dynamic data encryption method integrating quantum state and chaotic system, which is implemented based on quantum key generated by QKD system. The QKD system includes N pairs of transmitting end and receiving end, N≥1, and the method includes the following steps: S1: preprocessing to obtain plaintext sequence; S2: introducing external disturbance signal to dynamically adjust the chaotic system and generate pseudo-random sequence; S3: obtaining key stream sequence; S4: XOR operation to obtain intermediate ciphertext; S5: generating quantum key, XOR operation to obtain final ciphertext. The present invention also discloses a dynamic data encryption device integrating quantum state and chaotic system, which is used to implement the method. The present invention realizes dynamic change of key by introducing external disturbance signal to dynamically adjust the chaotic system, solves the problem of static key being attacked, has high adaptability and flexibility, and combines quantum key for encryption at the same time, improves encryption strength based on the theoretical security of quantum state, and effectively improves the security of data encryption.

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 discloses a dynamic transmission method and device based on quantum-like noise stream coding. The method comprises the following steps: generating a chaotic sequence by adopting a 4D hyper-chaotic model according to an initial key; introducing error bits into the initial key, dividing two different matrixes, and performing up-sampling to obtain a key stream real part BI and a key stream imaginary part BQ; carrying out serial-to-parallel conversion on the original data, and carrying out XOR processing on the data real part and the data imaginary part by utilizing the binary chaos sequence to obtain a data stream real part EI and a data stream imaginary part EQ; performing quantum-like noise stream encryption processing according to the data stream real part EI, the data stream imaginary part EQ, the key stream real part BI and the key stream imaginary part BQ to obtain a quantum-like noise stream encryption signal; scrambling a subcarrier and a symbol point of the quantum-like noise stream encrypted signal by using a chaotic sequence to obtain a scrambled signal; and performing OFDM modulation on the scrambled signal, and transmitting the scrambled signal in an optical fiber channel.

Technology permitting secure storage and transmission of data stream as well as tiered access to multiple data stream according to permission. Data streams may be encrypted using symmetric encryption performed with varying symmetric keys according to a key stream of symmetric keys. Native data may be discarded for safety. Whole or partial key streams may be encrypted using the public keys of authorized entities having permission to access respective data streams or portions thereof. Only the corresponding private keys can decrypt the encrypted key streams required to decrypt the encrypted data streams. Thus rigorous access control is provided. IT personnel accessing data stream files on a server or intruders maliciously obtaining files will not be able to derive the data stream. Sensitive data streams may be stored using cloud services despite inherent risks.

The invention relates to a communication method and device, which are used for solving the problem that an ECU is easily eavesdropped when transmitting a message in the prior art. In the application, a first ECU operates a first key and a first fresh value to generate a key stream; performing XOR operation on the key stream and a to-be-transmitted first plaintext message to generate a first ciphertext message; and sending the first ciphertext message to the second ECU. Wherein the first fresh value is a value generated by a counter used for recording the message transmission times of the first ECU in the first ECU when the first ECU transmits the message. The first ECU transmits the first ciphertext message to the second ECU, so that the first message transmitted by the first ECU can be prevented from being eavesdropped, and the confidentiality of transmitting the message by the first ECU can be improved.

The invention discloses an unmanned aerial vehicle control method and device based on a random key stream, and a medium, and relates to the technical field of aircraft control. The method comprises the following steps: presetting a chaos initial value for a main chaos system of an encryption end; selecting a switching strategy according to the current state component of the main chaotic system so as to switch the auxiliary chaotic system; generating a random key stream coefficient through a seed random number generator, and combining the random key stream coefficient with the chaotic initial value to obtain a private key; acquiring an aircraft measurement data plaintext, injecting the plaintext into the chaotic system, and generating a ciphertext in combination with the random key stream coefficient; transmitting the ciphertext to a decryption end, synchronizing the private key and the switching strategy at the decryption end, and restoring the plaintext; the restored plaintext is input into a state feedback controller, an anti-saturation control instruction is generated, and the state feedback controller comprises a nonlinear compensation function. According to the method, the measurement data of the aircraft is encrypted and decrypted by the chaotic system key stream, the length of the private key is expanded, and the security is improved.

Examples are described for dynamically encrypting and / or decrypting a file formed of multiple blocks of ordered data. In one example, a method of dynamically encrypting a file to enable partial decryption of the file includes generating, using a secret key and one or more initialization vectors, a keystream for the multiple blocks of ordered data, encrypting the multiple blocks of ordered data of the file by performing a logical operation of the keystream with the multiple blocks of ordered data in a one-to-one correspondence, and building a file index of the file to identify location information of the multiple blocks of ordered data. The method may further include dynamically decrypting at least a portion of the file by decrypting at least one selected block of encrypted data of the file using a portion of the keystream, the portion of the keystream corresponding to the at least one selected block.

The invention relates to the technical field of electric digital data processing, and discloses an intelligent campus network security protection system. A network data acquisition module of the system continuously monitors data transmission flow of a smart campus network environment to obtain an original data packet; the chaotic encryption engine encrypts an original data packet by using a key stream based on dynamic chaotic mapping, wherein the key stream is generated by multi-chaotic system switching and a random parameter distribution mechanism; the security protocol processing module converts the encrypted data packet into a format conforming to a network security protocol standard and transmits the encrypted data packet; the data decryption unit decrypts the received encrypted data packet; the security threat analysis module identifies and estimates potential network attack behaviors according to the decrypted plaintext data; and the protection strategy controller generates and executes a network security protection instruction according to the threat analysis result. The system can effectively protect the network security of the smart campus, resist various network attacks, and ensure the security of data transmission and storage.

The invention relates to the technical field of image encryption, and discloses an image encryption and decryption system, method and device and a medium. The system comprises a secret key module used for transmitting initial information to an algorithm module; the initial information comprises key information and an initial vector; the initial vector represents an auxiliary parameter in encryption; the algorithm module is used for detecting the to-be-processed image data and converting the initial information into a target key stream with a corresponding length based on the data length of the to-be-processed image data; and the data processing module is used for encrypting / decrypting the to-be-processed image data according to the target key stream to obtain an encrypted / decrypted image. According to the invention, the security of image data transmission can be improved.

The invention relates to the technical field of image encryption, and discloses an image steganography method and system based on dynamic latent variables and frequency domain embedding, and the method comprises the steps: obtaining a hash value and a plurality of secret keys of a to-be-encrypted color plaintext image; constructing a hyperchaotic system, and iteratively generating a plurality of key streams; a to-be-encrypted color plaintext image is decomposed into R, G and B channel matrixes, and three ciphertext sequences are obtained based on the three channel matrixes; the method comprises the following steps: initializing a noise image, determining a time step by using a secret key, and executing reverse denoising of a denoising diffusion implicit model (DDIM) with a fixed step length to obtain an intermediate latent variable; based on the intermediate latent variable and the three ciphertext sequences, obtaining a dense frequency domain-containing sub-band, and performing inverse discrete wavelet transform on the low-frequency sub-band and the dense frequency domain-containing sub-band to obtain a dense latent variable; and executing DDIM denoising of the time step by taking the secret-containing latent variable as a starting point to obtain a secret-containing image. By adopting the method, the security and visual quality of image steganography can be improved, and high embedding capacity is ensured.

The invention relates to the technical field of Internet of Things and information, in particular to an Internet of Things information service method and system based on artificial intelligence, and the method comprises the steps: collecting monitoring data of an Internet of Things sensing layer; before monitoring data is transmitted to an application layer of the Internet of Things, the monitoring data is used as plaintext data to be encrypted, and initial vectors during encryption and decryption of the plaintext data in different rounds are adaptively adjusted by analyzing features of the plaintext data; performing encryption transmission on each round of plaintext data in the Internet of Things according to the initial vector during each round of plaintext data encryption and decryption; in the encryption transmission process, linear regression analysis is carried out according to the similarity between any round of key stream and all previous historical rounds of key streams, and whether an encryption party updates an original initial vector randomly generated for the first time or not before each round of encryption and decryption is re-judged. The invention aims to ensure the security and high efficiency of the Internet of Things information service and improve the quality of the Internet of Things information service.

The invention belongs to the technical field of embedded system information security, and particularly discloses a program control flow protection system and method based on stack data confidentiality and integrity. According to the method, the key stream is generated and managed during memory access of the special hardware for micro-architecture level design, and quick encryption and decryption calculation of the stack key data is realized through the exclusive-or operation of the key stream and the stack data. The stack data confidentiality protection supports the burst transmission property of an AHB-Lite bus on which stack data transmission depends, and the execution overhead of a program control flow protection method is reduced; on the basis of data encryption, MAC codes are calculated and verified when stack data are written in and read out based on a stack data integrity verification architecture of the MAC codes, real-time detection of tampering of stack key data is achieved, and program control flow abnormity is found in time. Through parallel encryption and decryption and integrity verification of the stack data, protection of the program control flow is realized from the aspect of stack data protection.

In some implementations, an apparatus may receive a first copy of payload data and a corresponding first cyclic redundancy check (CRC) code, and a second copy of the payload data and a corresponding second CRC code. Each of the first copy and the second copy may be encrypted with an identical keystream. The apparatus may decrypt, using the keystream, the first copy to obtain first decrypted data and the second copy to obtain second decrypted data, append the first CRC code to the first decrypted data to form first data, append the second CRC code to the second decrypted data to form second data, determine one or more bit positions, at each of which the first data and the second data have bit values different from each other, and correct, based on the one or more bit positions, an error contained in the first data.

The invention provides a communication method and a communication device supporting a variable authentication label length, and the method comprises the steps: generating a first key stream and a second key stream according to input data through employing a ZUC algorithm, and carrying out the encryption processing of the input data through employing the first key stream, and obtaining a ciphertext message; a secret key mixing step: performing shift operation on the current secret key and the next secret key in the second secret key stream to obtain secret key mixed data; a first updating step: updating the next secret key as the current secret key, and sequentially repeating the secret key mixing step and the first updating step for at least one time until all secret key mixed data is obtained; calculating a target message authentication code according to the second key stream and all key mixed data; and sending the ciphertext message and the target message authentication code to a communication receiver. The problem that in the prior art, the bit number of integrity verification is too single, and integrity verification of different lengths cannot be adopted for messages of different importance degrees, so that the risk that a secret key is attacked and cracked is increased is solved.

The invention provides an unmanned aerial vehicle path tracking control method based on chaotic encryption and disturbance observation, and belongs to the technical field of unmanned aerial vehicle control, data encryption and interference resistance. Comprising the steps that measurement data of an aircraft is encrypted through a key stream, and the key stream is obtained through Logistic map chaotic nesting encryption, chaotic system switching and random key stream coefficient distribution; transmitting the ciphertext measurement data to a controller of the aircraft for decryption based on the communication interface; generating a control instruction according to the decrypted measurement data; a chaos encryption algorithm and a disturbance observer control strategy are combined, and the dual requirements of the VTOL-FW for measurement data secure transmission and anti-disturbance control in a dynamic flight scene are met.

The invention relates to the technical field of image encryption, in particular to a Logistic mapping encryption method for color coordinate modulation. The method specifically comprises the following steps: exciting rare earth luminescent nanoparticles on a target object through a light source to generate a plurality of color coordinates; obtaining an initial value and a control parameter according to the plurality of color coordinates; constructing a one-dimensional chaotic mapping, obtaining a chaotic sequence based on the one-dimensional chaotic mapping, the initial value and the control parameter, and taking the chaotic sequence as a key stream; and taking the color coordinates as plaintext blocks, and encrypting the plurality of plaintext blocks through an AES symmetric encryption algorithm by using the key stream to obtain a to-be-transmitted ciphertext. According to the method, the calculation efficiency is improved, the usability and the safety of the encryption method are improved, and the problems that an error is caused by the internal instability of a chaotic system in an existing Logistic mapping encryption method and the encryption and decryption efficiency is influenced under the high iteration frequency are solved.

The invention discloses a parallel image encryption method based on one-dimensional improved Logistic mapping, which relates to the technical field of image encryption, and is characterized by comprising the following steps: S1, designing improved one-dimensional Logistic mapping; s2, generating a key of a password system from the plaintext information; s3, a color image to be encrypted is split into three independent color channels, and preparation is made for parallel processing; and S4, generating a key stream of the cryptosystem by using the key and the improved one-dimensional Logistic mapping. The technical problem to be solved by the invention is to provide an image encryption method based on one-dimensional improved Logistic mapping parallelism, and a chaotic sequence is generated through improved Logistic mapping, so that pixel-by-pixel encryption processing is carried out on an image. According to the method, the confidentiality and the attack resistance of the image data are enhanced, and the encryption speed is increased, so that the method is suitable for scenes such as real-time image transmission and large-scale image storage.

The present application relates to the field of Internet of Things and information technology, and specifically to an artificial intelligence-based Internet of Things information service method and system, the method comprising: collecting monitoring data from the Internet of Things perception layer; encrypting the monitoring data as plaintext data before transmitting it to the Internet of Things application layer, adaptively adjusting the initial vectors for different rounds of plaintext data encryption and decryption by analyzing the characteristics of the plaintext data; encrypting and transmitting each round of plaintext data in the Internet of Things based on the initial vectors for each round of plaintext data encryption and decryption; and during the encrypted transmission process, performing linear regression analysis based on the similarity between any round of key stream and all previous historical rounds of key streams, and re-determining whether the encrypting party updated the original randomly generated initial vector before each round of encryption and decryption. The present application aims to ensure the security and efficiency of Internet of Things information services and improve the quality of Internet of Things information services.

The embodiment of the invention provides an information encryption processing method and device, equipment, a medium and a program product, and the method comprises the steps: carrying out the Hash calculation of the obtained user registration information in an information encryption process, obtaining a Hash value, extracting an encryption key and an authentication key from the Hash value, and performing encryption calculation on the user registration information according to a key stream generated based on the initial encryption parameter and the encryption key to obtain ciphertext information, performing encryption calculation based on the ciphertext information and the authentication key to obtain an encryption authentication tag, and storing the ciphertext information and the encryption authentication tag in a preset storage address. And the storage security of the user registration information is improved.

The invention discloses a key stream generation method based on a five-dimensional chaotic system, solves the problem that an existing image encryption method based on the chaotic system is complex, and belongs to the field of image encryption. The method comprises the steps that a novel five-dimensional chaotic system is established, the size of a to-be-encrypted image is obtained, k is the length of the to-be-encrypted image, and w is the width of the to-be-encrypted image; discretizing the five-dimensional chaotic system, setting a secret key, taking the secret key as a system variable initial value and a system parameter of the five-dimensional chaotic system to obtain five groups of sequences of which the length and the width are k * w, and generating a secret key stream according to the five groups of sequences of which the length and the width are k * w; and performing image encryption on the to-be-encrypted image by using the key stream. The five-dimensional chaotic system provided by the invention has rich dynamic behaviors, and the key stream is generated by adopting a discretization processing method, so that the additional complexity of the algorithm caused by solving a differential equation in the traditional encryption algorithm is avoided.

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.

The invention discloses a secure image data transmission method oriented to IIOT multi-user communication. According to the invention, a highly dynamic confusion-diffusion image encryption framework is constructed based on high-order chaotic mapping, a hash function and dynamic DNA coding and operation. In the framework, after a selected IoT device receives a chaotic signal broadcasted by an edge node, the device synchronizes its internal chaotic system and generates a key stream for encrypting image data. And the encrypted image data is transmitted to the edge node through a wired or wireless network. And the edge node of the receiving end generates a corresponding decryption key and decrypts the decryption key by synchronizing the chaotic system of the edge node, so that the original image data is recovered.

A quantum method that uses the Mz quantum circuit that receives a given single chaotic value to generate strong quantum key stream of three keys. The method includes encrypting a quantum plain color image; applying set of CNOT gates between qubits of a quantum image and qubits of a quantum key to obtain a quantum encrypted image; generating a new quantum key, applying additional set of CNOT gates between the qubits the quantum color image, and the corresponding qubits of the quantum key as target qubits; performing a quantum plain scrambling (QPS) operation; and applying set of CNOT gates; and obtaining, by the quantum circuit, a quantum ciphered image.

The invention provides an Android APK reinforcement method and system oriented to high-strength code protection, and belongs to the technical field of computer software, and the method comprises the steps: obtaining a resource call chain during the operation of an Android application through a reflection heat loading technology, and generating a dynamic encryption key stream; performing segmented encryption on the key resource according to the dynamic encryption key stream to obtain encrypted resource data; analyzing a bottom-layer instruction sequence of the encrypted resource data by adopting an instruction-level semantic analysis technology, and generating a semantic conversion template; performing dynamic re-signature on the package body according to the verification result to obtain a re-signed application package body; monitoring the re-signed application package body through a runtime reverse protection mechanism, and obtaining an abnormal behavior log; if the dynamic injection attack is detected in the abnormal behavior log, protection logic encryption is activated, and an irreversible protection module is generated; and updating an encryption strategy of the data stream during operation according to the irreversible protection module to obtain an optimized resource protection scheme. According to the method and the device, the resource security during Android application running is remarkably improved.