20results about How to "Large key space" patented technology

The invention discloses a color image encryption method based on a finger vein secret key and off-axis digital holography. The color image encryption method comprises the encryption steps that firstly, red, green and blue channel data of a color plaintext image are separated; performing encryption based on DNA coding on each channel by using the finger vein data of the encrypted user; thirdly, embedding the DNA coding encryption result into the host image by using a discrete wavelet transform-based technology to generate an encrypted watermark image; and finally, performing encryption based on a Gyrator transform domain and off-axis digital holography on the encrypted watermark image by using the finger vein data and the digital key to generate a ciphertext hologram. And a decryption step: firstly, carrying out identity verification on a decryption user by using a finger vein authentication technology based on the convolutional neural network, decrypting the ciphertext hologram by using the finger vein data stored in the database after the authentication is successful, and recovering a plaintext image. The encryption method provided by the invention has the advantages of high security, finger vein key robustness, digital key sensitivity, large key space and high decryption quality.

The invention provides an audio signal encryption method and apparatus, an electronic device and a storage medium. The method specifically comprises the steps of converting a key seed into an encryption matrix based on a preset coding rule and a chaos matrix, and segmenting the encryption matrix into a plurality of key vectors; the audio signal encryption module obtains an original audio signal and divides the original audio signal into a plurality of original audio vectors; the audio signal encryption module scrambles all the original audio vectors to obtain a plurality of scrambled audio vectors, acquires an audio mark and a first vector from each scrambled audio vector, and encrypts the first vector based on the key vector; and synthesizing all the corresponding scrambled audio vectors and the first vector based on the audio mark to obtain a plurality of encrypted audio vectors, and generating an encrypted audio signal based on the encrypted audio vectors. According to the method provided by the invention, encryption can be carried out with fewer resources during encryption, and the time for encrypting the audio signal is shortened.

The invention discloses an encryption communication method and system based on biological genetic coding chaos driving, and the method comprises the steps: receiving an original bit stream and an initial secret key, and generating a chaos sequence group according to the initial secret key through two hyperchaos models; performing DNA coding encryption on the original bit stream by using the chaos sequence to obtain a gene transmission sequence, and performing DNA decoding on the gene transmission sequence to obtain a transmission bit stream; performing constellation mapping on the transmission bit stream to obtain a constellation diagram, and performing subcarrier scrambling, symbol scrambling and constellation rotation on the constellation diagram according to the chaos sequence; performing OCDM modulation on the constellation diagram through an inverse discrete Fresnel transformation matrix to obtain a transmission signal; hiding the initial key in a frame header of a transmission signal, and sending the transmission signal to a receiver through a transmitter; according to the invention, multi-layer encryption of the OCDM signal and dynamic secret key follow-up transmission are realized.

The invention discloses a color image encryption method based on dynamic constraint holographic coding, and the method comprises the encryption steps: firstly, coding a color plaintext image into a pure phase hologram based on dynamic constraint holographic coding, and then converting the pure phase hologram into a conversion amplitude through phase-to-amplitude conversion; finally, the converted amplitude is encrypted into a visible ciphertext image by using an iterative phase retrieval algorithm under structured light illumination, and a diffraction neural network is generated at the same time; and a decryption step: firstly, generating decryption structured light by using the decryption structured phase mask to illuminate the visible ciphertext image, carrying out forward diffraction propagation, generating a reconstruction amplitude after phase modulation of the diffraction neural network, and then converting the reconstruction amplitude into a conversion phase through amplitude-phase conversion, and finally, performing color holographic reconstruction decryption on the converted phase to obtain a color decrypted image. The color image encryption method provided by the invention has the advantages of large key space, high security and high concealment.

This invention proposes a chaotic speech encryption method based on a time-frequency dual-track system, belonging to the field of speech encryption technology. The method includes: preprocessing the original speech data to obtain a mono-channel filtered speech signal; extracting parameter features and calculating normalized speech energy as input to the chaotic system; generating a chaotic sequence and performing multi-step enhancement to obtain an enhanced key stream; generating a scrambling index after Fourier transforming the speech signal; scrambling and reshaping the real and imaginary components in the frequency domain and performing XOR diffusion; recombining the encrypted frequency domain matrix and inversely transforming it back to the time domain; and obtaining the final ciphertext through index permutation and fusion of speech feature parameters. This invention uses a frequency-domain dual-track scrambling-diffusion mechanism combined with an attractorless six-dimensional conservative hyperchaotic system to generate an enhanced key stream, thus avoiding speech distortion in time-domain encryption, triggering a global avalanche effect, and simultaneously improving the algorithm's resistance to various attacks, ensuring both the security of speech encryption and the fidelity of speech restoration.

The invention discloses an image encryption method based on a new non-adjacent dynamic coupling mapping lattice and cross scrambling. The method comprises the following steps: acquiring an image to be processed; preprocessing an image to be processed to obtain parameters and initial values required by an encryption process; generating a chaotic sequence based on the parameters and the initial value required by the encryption process; adopting a cross traversal algorithm, selecting different central points and traversal directions of the image to perform preliminary scrambling on positions of image pixels, and obtaining an initial scrambling image; a random cross transformation algorithm is adopted to perform scrambling and diffusion operation based on the initial scrambling image, the pixel position of the image is changed, the pixel value of the image is preliminarily changed, and a semi-encrypted image is obtained; and carrying out secondary diffusion on the semi-encrypted image by adopting a bidirectional disturbance index diffusion algorithm to obtain an encrypted image. According to the method, corresponding attacks can be effectively resisted, and good safety is achieved; and the time efficiency is relatively high.

This invention discloses a multi-image encryption method based on 3D face keys and multiplexed digital holography. The encryption steps include: using 3D face high-order data acquisition technology, chaotic face structured light phase mask generation technology, grating modulation technology, multiplexed digital holographic coding technology, and watermark embedding technology based on discrete wavelet domain singular value decomposition, multiple plaintext information images can be encrypted into an amplitude-type holographic ciphertext and embedded into a host image; the decryption steps include: the user must first calculate the face similarity using a 3D face multilayer perceptron neural network. If the similarity exceeds a preset threshold, authentication is successful. Then, the final decryption result is generated using watermark image extraction technology based on discrete wavelet transform, image decryption technology based on the Cramer-Kroni relation, and spectral filtering technology; otherwise, authentication fails. This method has advantages such as a large key space, high sensitivity, strong robustness of the 3D face key, and low decryption crosstalk.

The present invention relates to the field of chaotic system application and digital image encryption technology, and in particular to a digital image encryption method based on a combined chaotic pseudo-random number generator and the same. The encryption method includes: obtaining an image matrix composed of the size, number of channels and pixel values ​​of each sampling point of the original image; determining a grayscale image matrix according to the size, number of channels, image matrix and a preset first transformation algorithm of the original image; determining a diffusion image matrix according to the grayscale image matrix and a preset first diffusion algorithm. The beneficial technical effect of the present invention is that the combined chaotic pseudo-random number generator is not easy to degenerate on a limited precision platform such as a computer, has high sensitivity to changes in system control parameters and initial values, and generates a pseudo-random sequence with a long period and strong randomness. The encryption method has a large key space, high sensitivity to small changes in the plaintext image, strong resistance to various attack methods such as brute-force attacks and differential attacks, and high security.

The invention discloses a text encryption method based on a chaotic cryptographic algorithm principle, which comprises three modules, namely a sequence generation module and an S box amp, a text encryption sequence is produced based on an mKdv equation, the form of the mKdv equation is as follows: Arnold mapping is adopted to construct an S box and a P box, then the text encryption sequence is produced based on the mKdv equation for scrambling by a sorting method, and encryption operation is completed through multiple rounds of iteration. A Knockoff variable selection method and a differential evolutionary algorithm are combined, the basic idea of the algorithm is to simulate an original variable by constructing a group of Knockoff variables, an optimal solution is found by comparing the correlation between a real variable and the Knockoff variables, and theoretical analysis and experimental results show that the method has the advantages of large key space, high sensitivity, high speed, good safety and high reliability. And the problem that a plurality of decision variables and a plurality of decision targets exist can be solved.

An encryption method based on a switching inertia neural network with leakage time lag relates to the field of audio encryption. It solves the problem that the existing encryption method that relies on neural networks adopts a fixed network structure and a static processing mechanism, resulting in the encryption effect being limited by the model performance. The switching inertia neural network with a mixed time-varying delay and leakage time lag constructed by the present invention is used as an audio encryption drive system; and an audio decryption response system is constructed based on the designed synchronization controller and the audio encryption drive system; the subsequent encryption and decryption process is realized under the condition of global exponential synchronization controlled by the synchronization controller. The existence of multiple time lags forms a mixed time-varying delay, and the dynamic behavior of the system is more difficult to predict. The introduction of the time lag inertia weight factor makes the encryption process more complicated, has stronger resistance to randomness and reversibility, and the design of the synchronization controller greatly increases the difficulty of cracking. It is mainly used for the encryption of audio data.

The present invention provides a multi-key image encryption method based on a five-dimensional conservative hyperchaotic system, comprising: constructing a five-dimensional conservative hyperchaotic system; generating a chaotic pseudo-random sequence for the first scrambling based on a plaintext image; scrambling the plaintext image according to the chaotic pseudo-random sequence for the first scrambling; generating a pseudo-random sequence for forward diffusion and a pseudo-random sequence for reverse diffusion based on the first scrambling graph; diffusing the first scrambled image according to the pseudo-random sequence for forward diffusion and the pseudo-random sequence for reverse diffusion; generating a chaotic pseudo-random sequence for the second scrambling based on the diffusion graph; scrambling the diffusion graph according to the chaotic pseudo-random sequence for the second scrambling to generate a ciphertext image. The present invention designs a multi-key image encryption algorithm using a wide initial value range of the system, solves the key leakage problem and the chaotic sequence utilization problem, and thus improves the security of image encryption.

A chaotic image encryption method based on three-dimensional Rubik's cube scrambling and diffusion, the method converts the pixels in the plaintext image into a three-dimensional Rubik's cube pixel matrix through a preprocessing operation mode and generates a corresponding key according to the size of the plaintext image and the initial parameters of the non-equilibrium point chaotic system; at the same time, the chaotic sequence generated by the non-equilibrium point chaotic system is converted into a three-dimensional Rubik's cube chaotic matrix with the same size as the three-dimensional Rubik's cube pixel matrix; according to the key and the three-dimensional Rubik's cube chaotic matrix, the three-dimensional Rubik's cube scrambling and diffusion operation of the three-dimensional Rubik's cube pixel matrix is ​​completed in the three-dimensional space; after three rounds of three-dimensional Rubik's cube scrambling and diffusion operations, a ciphertext image is obtained. The method of the invention can achieve a good encryption effect and effectively protect the information security of the image.

The invention provides a hyperchaotic image encryption method based on magic cube three-dimensional space parallel rotation scrambling, and the method comprises the steps: generating a pseudo-random sequence as a preprocessing parameter, an Arnold transformation parameter and a magic cube scrambling parameter through a seven-dimensional hyperchaotic system, and carrying out the preprocessing of an R channel, a G channel and a B channel of a plaintext image through the pseudo-random sequence, the Arnold transformation parameter and the magic cube scrambling parameter, then, Arnold transformation is controlled by a pseudorandom sequence to scramble the preprocessed image so as to improve the defect that data aggregation easily occurs during subsequent scrambling of the three-dimensional magic cube, then, an obtained two-dimensional chaos matrix is converted into a three-dimensional matrix, a rotating shaft, the number of rotating layers and the rotating angle are dynamically selected by the pseudorandom sequence, and the three-dimensional chaos matrix is obtained. And parallel rotation scrambling of the magic cube three-dimensional space is carried out. According to the method, the image pixel values are mapped to all the small cubes contained in the whole Rubik's cube for three-dimensional space scrambling, and the characteristics of the three-dimensional structure of the Rubik's cube are better utilized, so that the scrambling complexity is improved, the safety of the ciphertext image is improved, the key space is larger, and the scrambling effect is better.

The invention provides a health data processing system for home health Internet of Things equipment, and the system comprises a data cleaning module which is configured to be used for receiving a data stream transmitted by the home health Internet of Things equipment, cleaning non-health related data, and retaining health related data; the data conversion module is connected with the data cleaning module and is configured to be used for converting the health-related data into health data codes through a preset symptom conversion rule; the data encryption module is connected with the data conversion module and is configured to be used for encrypting the health data codes by using an improved AES encryption method and then transmitting the health data codes; according to the invention, the conversion from the smart home equipment data to the health data is realized, and the association between the collected equipment data and the health data is established. According to the invention, the operation time in the embedded system is greatly reduced, the overall efficiency of the encryption process is improved, the security of data transmission is enhanced, and the resource occupation of the embedded system is reduced.

The present invention proposes an image adaptive scrambling encryption method based on chaotic mapping. The method adopts a scrambling-diffusion encryption structure. First, each pixel of an original image of size M×N is decomposed into hexadecimal to obtain a high-level image and a low-level image. Secondly, the two images are cross-diffusion encrypted by introducing a chaotic sequence generated by a chaotic mapping. Then, the two encrypted images obtained after cross-diffusion encryption are subjected to mutual adaptive selective scrambling in combination with the chaotic sequence. Finally, the two scrambled images are recombined into one image, and the chaotic sequence is used to perform bidirectional modular diffusion encryption on the image to obtain the final encrypted image. The method provided by the present invention is closely related to the original image, has high encryption efficiency and ideal encryption effect, and can well resist classic cryptanalysis methods such as chosen plaintext attacks.

The invention belongs to the field of data encryption, and discloses a face image data encryption method based on chaotic tent mapping, which comprises the following steps: S1, setting an initial state of a chaotic system; s2, receiving a face image and an initialization parameter, and generating an initial seed; s3, scrambling and diffusing the face image to obtain encrypted images R ', G' and B 'of R, G and B channels; s4, respectively carrying out DNA coding on R ', G' and B 'to obtain vectors RDNA, GDNA and BDNA; s5, respectively mixing the RDNA, the RDNA and the RDNA to obtain encrypted vectors R 'DNA, G' DNA and B 'DNA; and S6, decoding and combining the R 'DNA, the G' DNA and the B 'DNA to obtain an encrypted face image. According to the invention, the security and reliability of the algorithm are improved. And the complexity of the encryption process is remarkably improved while the algorithm efficiency is kept. According to the invention, through the nonlinear characteristic of the chaotic system and the randomness of DNA coding, a defense mechanism for a known attack mode is enhanced.

The present invention belongs to the field of signal transmission technology, and specifically is a method for transmitting multidimensional data confidentially during track laying. Transmission is performed through a multidimensional data confidentiality transmission system, and the multidimensional data confidentiality transmission system includes various sensors for collecting operation data, a unified data processing unit, a data encryption processing unit, a data cloud platform, and a data decryption processing unit; the following steps are included, S100: the sensors corresponding to the track laying equipment collect the operation data of various types of equipment in the track laying process; S200: after the operation data is fixed by floating point numbers and data arrangement operations are performed in the unified data processing unit, the data vector is encrypted in the data encryption unit; S300: the encrypted data is transmitted to the data cloud platform, the data monitoring center receives the ciphertext data from the data cloud platform, decrypts the data, and parses the decrypted data to obtain the operation data of each device. The present invention improves the security and the operation speed of the system, has a large key space, and can resist attacks.

The invention discloses an optical communication system and method based on amplitude phase two-dimensional chaotic encryption, in the system, light of a first laser is coupled with a light text signal through a Mach-Zehnder modulator and an optical coupler and then is divided into two beams, and one beam sequentially passes through a delay line and the like and then enters the Mach-Zehnder modulator; the other beam is injected into the phase modulator; light of a fifth laser is divided into two beams by a third optical coupler, and one beam passes through a reflector; the other beam is divided into two beams through a fourth optical coupler, and one beam is used for channel transmission; and the other beam enters a first phase modulator after passing through a first circulator and the like. The light after channel transmission passes through a circulator and the like and then enters a phase modulator; the other beam is divided into two beams after passing through a phase modulator and an optical coupler, and one beam is connected with an optical mixer; and the other beam sequentially passes through a second delay line and the like and then enters a second Mach-Zehnder modulator. Light of the second laser passes through the second Mach-Zehnder modulator and then enters the optical mixer; and decryption is realized through coherent detection.

The invention relates to the technical field of information tracing, in particular to an agricultural product comprehensive sales information tracing method and system. The method comprises the steps that the agricultural product tracing platform encrypts source information of agricultural products and returns an encryption result to a consumer, and the encryption process comprises the steps that the source information is converted into a digital sequence; the method comprises the following steps of: constructing a character sequence, a moving sequence and a symbol sequence, and encrypting the digital sequence, namely converting a # imgabs1 # number # imgabs2 # number in the digital sequence into a # imgabs3 # number with a symbol according to a # imgabs0 # element in the symbol sequence, and when the # imgabs4 # number, taking an element with an index of # imgabs5 # in the character sequence as a ciphertext # imgabs7 # of # imgabs6 #, and taking the # imgabs8 # as the length of the character sequence; and obtaining an update index # imgabs10 # of the # imgabs9 # according to the moving sequence, and updating the character sequence according to the # imgabs11 #. The method is complex in encryption result, has an avalanche effect, can resist statistical analysis attacks and brute force attack attacks, and improves the credibility of agricultural product sales information traceability.

The invention discloses a data storage and transmission security method suitable for an Android terminal. The method specifically comprises the following steps: creating an independent isolation space isolated from a main space on the Android terminal equipment, and deploying an enterprise application in the isolation space; implementing isolation protection on applications and data in the isolated space environment; encrypting and storing the data in the isolated space environment through the FBE by using a double-encryption key bound with the equipment screen locking password; performing application permission constraint and data access control on the isolation space; establishing an encrypted data transmission channel between the Android terminal and the security terminal; a data access auditing and monitoring mechanism is introduced, each access request for sensitive data is recorded, and a non-tampering log is generated. According to the invention, an omnibearing and deep defense data security access system is constructed, sensitive data stored on the Android mobile device by a user can be effectively protected, and security transmission of data between terminals can be realized.