23 results about "Color image encryption" patented technology

The invention discloses a color image encryption method and device, and the method comprises the steps: obtaining a to-be-encrypted plaintext image, carrying out the extraction of global image features of the plaintext image, and generating an internal key of the plaintext image based on the global image features; a random external secret key is obtained, the external secret key and the internal secret key are sequentially and complexly mapped to a parameter space from a secret key space to obtain four groups of parameter sets used for generating a chaotic sequence, and the parameter sets comprise control parameters # imgabs0 # and initial values # imgabs1 # and # imgabs2 #; inputting the four groups of parameter sets into a preset PLS composite chaotic system to generate four groups of independent chaotic sequences # imgabs3 #; and performing encryption processing on the plaintext image based on the chaos sequence # imgabs4 # and the chaos sequence # imgabs5 # to obtain a semi-encrypted image. According to the method and the device, the security and the encryption efficiency are improved.

The invention discloses a color image encryption method based on deep learning and a four-dimensional Lorentz chaotic system, and belongs to the field of information security and image encryption. According to the method, a CNN deep learning network is constructed, a color image is divided into RGB channels, features of a pixel matrix of each channel are extracted as initial conditions of a chaotic differential equation, and a data set is obtained through solving by a variable-step-size fourth-order Runge-Kutta method and used for training the CNN network. And carrying out first round encryption on the pixel matrix by using a key sequence generated by the trained CNN network, carrying out Arnold scrambling and forward and reverse recursive diffusion on the pixel matrix by using a random chaos sequence generated by an improved four-dimensional Lorentz equation to complete second round encryption, merging the RGB three-channel pixel matrix, and outputting a final color encrypted image. The problems that an existing color image encryption method is low in encryption strength and cannot make full use of color image characteristics are solved.

The invention discloses a quick color image encryption method based on a four-dimensional discrete hyper-chaotic system. The method comprises the following steps of: disturbing initial condition parameters through a hash value obtained by a plaintext image and an external random character string to obtain disturbed initial condition parameters; substituting the four-dimensional discrete hyper-chaotic system for iteration to obtain four chaotic sequences; carrying out compressed sensing and two-dimensional discrete wavelet packet transformation on the plaintext image to obtain a to-be-encrypted pixel matrix; rearranging the chaotic sequence; performing index scrambling on the matrix m1 and the matrix m3 by adopting the matrix m2 and the matrix m4 to obtain a matrix M1 and a matrix M2; scrambling the M1 by adopting the M2 to obtain a matrix M3; scrambling a to-be-encrypted pixel matrix by adopting the matrix M3 to obtain a pixel matrix P4; and exporting a pulse sequence and coordinates for diffusion from the chaos sequences s2, s3 and s4, and sequentially acting on a pixel matrix P4, thereby obtaining a final ciphertext image. According to the method, the color image can be effectively encrypted, and the method has good security for resisting various attacks.

The present invention discloses a color image encryption method, system and device based on a chaotic neural network, including extracting the R component, G component and B component of a color image, respectively generating an R component scrambling transformation key, a G component scrambling transformation key and a B component scrambling transformation key based on a three-dimensional chaotic neural network, performing row and column random scrambling on the color image according to the scrambling transformation key to obtain a scrambled image, splitting the scrambled image into multiple parts by columns, respectively generating diffusion keys based on the three-dimensional chaotic neural network, diffusing all parts of the split image according to the diffusion keys to obtain all parts of the diffused image, scrambling and splicing all parts of the diffused image by using an array splicing function to obtain a spliced image, synthesizing the components of the spliced image to obtain an encrypted image of the color image, strengthening randomness, enhancing the anti-attack ability and improving security.

The application discloses a kind of asymmetric color image optical encryption methods based on generalized singular value decomposition, including encryption process and decryption process, encryption process: asymmetric optical encryption system of color image, the technical scheme adopted is, in encryption system, a kind of double random phase encoding encryption scheme based on generalized singular value decomposition is designed, color image is first encoded into complex matrix, the complex matrix obtained is modulated with phase plate by generalized singular value decomposition, then encryption is carried out in optical Fourier transform domain using phase truncation technique, finally the ciphertext is received by charge coupled device.The application mainly aims at the problem that existing asymmetric encryption system based on phase truncation cannot resist special attack, a kind of modulation method based on generalized singular value decomposition is designed to image and random phase plate, the encryption algorithm can realize color image encryption, effectively resist shear attack, noise attack, chosen-plaintext attack and special attack.

The invention discloses a color image encryption method and system based on three-dimensional dynamic pixel code replacement. The method comprises the following steps: coding a color image to be encrypted; constructing a three-dimensional dynamic pixel replacement matrix by using the random number sequence stream, and generating a diffusion sequence required by secondary encryption; and replacing the encoded to-be-encrypted color image pixels according to the three-dimensional rectangular coordinates by using the three-dimensional dynamic pixel replacement matrix, and performing diffusion operation on the replacement result to complete secondary encryption to obtain a ciphertext image of the to-be-encrypted color image. According to the method, the characteristics of the color image are fully utilized, the 3D-DPRM three-dimensional pixel replacement matrix used for replacing the pixels of the R channel, the G channel and the B channel at the same time is constructed, the correlation between the channels is reduced, the effect of one image and one secret is achieved, and the safety and reliability of the ciphertext image are improved.

The invention provides a color image encryption method and device based on a coupled mapping grid system, and relates to the technical field of image encryption. The method comprises the following steps: generating an initial value of a coupled mapping lattice system by using a hash value of a color plaintext image P and an external key; iterating the coupled image lattice system based on a given control parameter and an initial value, and generating a chaotic sequence F corresponding to the chaotic system f (x) and a chaotic sequence X corresponding to the coupled image lattice system; sorting the chaos sequence F and the chaos sequence X, and generating a corresponding index matrix index and an index matrix xindex; performing dimension reduction on the color plaintext image P to generate a dimension-reduced image P1; scrambling the dimension-reduced image P1 by adopting an index matrix index and an index matrix xindex to generate a replacement image Pb; converting the chaos sequence F and the chaos sequence X to generate three diffusion matrixes with the same size as the color plaintext image; and diffusing the replacement image Pb by adopting the three diffusion matrixes to generate an encrypted color image.

The invention specifically discloses a parallel RGB color image encryption method based on DNA and CA fusion diffusion, and relates to the technical field of image information security. The method comprises the following steps: acquiring a hash value of an original image through a secure hash algorithm; generating an initial value and a parameter value of the chaotic system according to the hash value; carrying out overall replacement on the original image based on a random sequence generated by the two-dimensional chaotic system; separating each channel of the overall replacement image, generating a random sequence of the 1D-JSMPM chaotic system according to a hash value, and dividing the random sequence obtained by each channel; generating an initial matrix and a DNA coding matrix; carrying out Fibonacci replacement and DNA-CA fusion diffusion; carrying out dynamic DNA operation; zigzag scanning is carried out. And performing DNA decoding operation and merging to obtain a final encrypted image. According to the method, various attacks can be efficiently resisted, and reliable safety guarantee is provided for the RGB color image.

The present invention relates to a color image encryption method based on a four-dimensional memristive hyperchaotic system. The present invention includes the following steps: S1: Construct a four-dimensional memristive hyperchaotic system and discretize the system. S2: Read the color plaintext image information and split the color image to be encrypted into three primary color component matrices. S3: Obtain the initial value containing the plaintext information; combine the initial value with the discrete memristive hyperchaotic system for iteration to obtain a hyperchaotic sequence. S4: Preprocess the hyperchaotic sequence so that the chaotic sequence is applicable to image data to obtain a key sequence. S5: Use the key sequence to perform encryption operations on the rows and columns of the R, G, and B channels of the color plaintext image respectively. The initial key of the present invention contains the Hash value of the original image, and completes the permutation and diffusion operations of the image under the introduction of the Hash table structure and the Hilbert curve, making the relationship between the plaintext, ciphertext, and key more complex.

The invention discloses a color image encryption method, and relates to the technical field of image encryption. Comprising the following steps: reading color images according to three channels, and combining the color images into a first two-dimensional matrix; generating a plurality of encrypted chaotic sequences according to the hash value of the color image; carrying out multiple iterations on the expanded chaotic game algorithm by taking the first encrypted chaotic sequence as a selection rule to obtain a scrambling matrix; rearranging pixels in the first two-dimensional matrix to obtain a second two-dimensional matrix; performing dynamic DNA coding on the second two-dimensional matrix to obtain a first pseudo DNA sequence; setting four base points of the expanded chaos game algorithm as four basic groups and carrying out iteration to obtain a second pseudo DNA sequence; taking the fourth encrypted chaotic sequence as a mutation rule of a second pseudo DNA sequence to obtain a third two-dimensional matrix; and converting the third two-dimensional matrix into a fourth two-dimensional matrix to obtain a ciphertext image. According to the invention, the encryption efficiency of the color image can be improved, and the encryption security is enhanced.

The application provides a JPEG color image encryption method based on chaos theory and belongs to the technical field of image encryption. The method performs block scrambling in the (1) DCT transformation stage, only uses the image block as a unit to perform scrambling, and does not affect the compression performance; (2) the DC coefficient is subjected to XOR operation with a pseudo-random key sequence, which can effectively protect the value of the DC coefficient, improve the encryption security, and the operation is simple, which can reduce the encryption time; (3) the non-zero AC coefficient is subjected to sign transformation, the distribution relationship of the zero value AC coefficient and the non-zero value AC coefficient is not changed, the influence on the entropy encoding is not caused, and the compression performance is not lost; (4) the RSV pair recombination is proposed in the entropy encoding stage, on the one hand, the adjacent pixel correlation is effectively reduced, and then the encryption security is improved, on the other hand, compared with the existing scheme, no excessive data is added, and the influence on the compression performance is effectively reduced.

The invention belongs to the technical field of image encryption, and discloses a color image encryption method and system based on a memristive neural network, and the method comprises the steps: constructing a memristive Hopfield neural network; generating a secret key matrix according to the memristor Hopfield neural network; the method comprises the following steps: acquiring pixel value matrixes of a color image to be encrypted in R, G and B directions, and scrambling the positions of pixel points by using an Arnod scrambling method; and carrying out XOR operation on the scrambled pixel value matrix and the secret key matrix to obtain encrypted pixel value matrixes in the R, G and B directions, and restoring the encrypted pixel value matrixes into an encrypted color image pixel value matrix to obtain an encrypted image. Through the implementation of the encryption system, a dynamic protection mechanism of a color image can be constructed, and the acquisition and analysis of an unauthorized individual on the encrypted image content are effectively blocked, so that the confidentiality and integrity of visual information in the whole process of transmission, storage and processing are comprehensively guaranteed.

The invention relates to the technical field of image encryption, and particularly discloses a color image encryption method based on hybrid heterogeneous single-time-delay chaos and electronic equipment, and the color image encryption method comprises the following steps: generating a pseudo-random sequence set by using a plurality of heterogeneous single-time-delay chaos systems, according to the heterogeneous single-time-delay chaotic system, time delays are applied to different state variables of a chaotic system, and at least three time-delay chaotic systems with different dynamic behaviors are formed; a color image is layered into three independent pixel matrixes according to R, G and B channels. According to the color image encryption method based on the hybrid heterogeneous single-time-delay chaos, through innovative designs of dynamic sequence extraction, color image layered encryption, key space multi-dimensional expansion and the like of a heterogeneous single-time-delay chaos system, the problems that a traditional chaos encryption algorithm is small in key space, weak in attack resistance, poor in adaptability and the like are effectively solved; and excellent performance is achieved in the aspects of safety, real-time performance and expandability.

The present invention discloses a color image encryption method and device, including: obtaining a plaintext image to be encrypted, extracting global image features of the plaintext image, and generating an internal key of the plaintext image based on the global image features; obtaining a random external key, and sequentially mapping the external key and the internal key from the key space to the parameter space in a complex manner to obtain four sets of parameters for generating chaotic sequences, where the parameter sets include control parameters, initial values, and; inputting the four sets of parameter sets into a preset PLS composite chaotic system to generate four independent chaotic sequences; encrypting the plaintext image based on the chaotic sequences and the chaotic sequences to obtain a semi-encrypted image. The method and device of the present application improve security and encryption efficiency.

The invention discloses a color image encryption algorithm based on a four-dimensional memristor chaotic system, and relates to the technical field of image encryption, and the algorithm comprises the steps: collecting an original color image, obtaining an image matrix through image digitization, dividing the image matrix and a Sudoku matrix into image sub-blocks and Sudoku sub-blocks which are unified in specification, and carrying out image encryption on the image sub-blocks and the Sudoku sub-blocks; constructing a four-dimensional memristor chaotic system to generate a pseudo-random matrix, obtaining a diffusion matrix through forward diffusion in bidirectional diffusion, extracting a pixel value through a Sudoku perturbation algorithm, calculating a perturbation round, carrying out iterative perturbation on image sub-blocks, integrating residual parts to obtain a scrambling matrix, and decomposing pixels of the scrambling matrix into binary systems to obtain a scrambling matrix; according to the image encryption method, the row index is rearranged, the binary bit is rearranged and the binary bit is reconstructed into a decimal pixel in combination with a Latin square matrix diffusion algorithm, a reconstructed pixel matrix is obtained, finally, backward diffusion in bidirectional diffusion in S2 is adopted for post-integration, an encrypted image matrix is obtained, an encrypted color image is output, and the security, the anti-attack capability and the practicability of image encryption are improved.

The present application is directed to the problem that static DNA encoding and calculation rules are single, encryption process is separated from plaintext, and plaintext is vulnerable to attack, and proposes a color image encryption method based on new 4-dimensional hyperchaos and DNA random encoding calculation. The method first designs a new 4-dimensional hyperchaotic system, iterates the system to generate multiple pseudo-random sequences, generates new pseudo-random sequences and matrices by calculation and modification, decomposes the color image into R, G and B channel components, and then fuses them into a matrix, then encodes and calculates the image and the pseudo-random matrix according to the newly generated pseudo-random sequence, and then performs DNA random decoding, decomposes the matrix into channel components, and fuses to generate the final ciphertext image, wherein the initial value of the chaotic system is calculated by the SHA-512 algorithm. The encryption method proposed by the present application not only has large key space and strong sensitivity to plaintext, but also can effectively resist statistical, brute force and differential attacks.

The invention discloses a color image encryption method based on deep learning and optical chaotic signals, and the method comprises the steps: firstly carrying out the feature extraction of a color image through a deep learning model, and obtaining feature maps of RGB channels; secondly, the side emitting laser emits light with a set wavelength, an optical chaos phenomenon is caused through a chaos system, and a chaos optical signal is output. Then, the three channel feature maps are respectively coded into holograms through a spatial light modulator, a chaotic light signal is used as an illumination light source for irradiation, an encrypted chaotic light signal is generated through phase modulation and wavelength division multiplexing, and the encrypted chaotic light signal is separated into three independent channel signals through a beam splitter according to RGB wavelengths. And finally, performing inverse modulation decryption on the channel signal, restoring the optical information, converting the optical information into an electric signal, performing image restoration on the electric signal based on a random phase mask, and decrypting the image. According to the method, the security problem of encrypted information in the image encryption process can be effectively solved, and the encryption is more targeted and robust.

The present invention provides a color image encryption and decryption method based on compressed sensing and Latin cube. The encryption method mainly includes the following steps: based on a given external key and initial value, the Logistic-Sine-Cosine chaotic system is iteratively generated into four chaotic sequences X1, X2, X3, and X4, and the Henon chaotic system is iteratively generated into chaotic sequences Y1 and Y2; the plaintext image is sparsely processed using a wavelet sparse basis, and then the sparse matrix is ​​reordered using the chaotic sequences X1, X2, and X3. According to X4, a measurement matrix that meets the requirements is obtained, and compressed sensing measurement is performed on the three sparse matrices. In the scrambling and diffusion process, the chaotic sequence Y1 is used to generate a three-dimensional Latin cube and a two-dimensional 0-1 square matrix. The compressed and encrypted image is then scrambled and diffused according to specific rules to obtain the final compressed ciphertext image.

The invention discloses a color image encryption and decryption method based on a chaotic system and DNA coding, and the method comprises the steps: generating an initial parameter of a Lorenz chaotic system according to the pixel statistical characteristics of an original image, and driving the Lorenz chaotic system to generate a first pseudo-random sequence; scrambling the original image to obtain a scrambled image; according to the hash value of the scrambled image and random disturbance, generating an initial parameter of a variable Chua's chaotic circuit, and driving the variable Chua's chaotic circuit to generate a second pseudo-random sequence; constructing a chaos mask matrix, and performing DNA coding and operation according to the chaos mask matrix and the scrambled image to obtain a diffusion image; performing DNA decoding and recombination according to the diffusion image to obtain an encrypted image; and according to the encrypted image and the same initial parameters, repeating the inverse process of the steps to obtain a decrypted image. According to the method, the robustness of the algorithm is remarkably improved while high safety is kept.

This application provides a color image encryption method based on memristors and DNA encoding, relating to the fields of image encryption and information security technology, and solving the technical problems of insufficient key randomness and inadequate anti-attack capability. The method includes: obtaining a truly random bit sequence generated by a memristor; iterating the initial parameters and control parameters through a chaotic system to generate a first chaotic sequence and a second chaotic sequence; performing a first encryption transformation on the original pixel data based on the first chaotic sequence to obtain an intermediate encrypted data sequence; performing a second encryption transformation on the second chaotic sequence to obtain a numerical key, and dynamically selecting a DNA encoding rule according to the second chaotic sequence; and performing DNA encoding operations on the intermediate encrypted data sequence based on the numerical key and the selected DNA encoding rule to obtain ciphertext image data. This application is used in image encryption processes.

The present invention discloses a DNA color image encryption method and system based on fixed-time synchronization of a fractional-order chaotic system. The method comprises: setting a synchronization error based on a master system of the fractional-order chaotic system established at a data transmitter and a slave system of the fractional-order chaotic system established at a data receiver; designing a fixed-time synchronization controller based on the synchronization error, and applying the fixed-time synchronization controller to the slave system of the data receiver to synchronize the slave system of the data receiver with the master system of the data transmitter within a fixed time; and synchronizing the slave system of the data receiver with the master system of the data transmitter to enable the data transmitter to implement DNA color image encryption using DNA coding rules based on the color image to be encrypted and the synchronized master system signal. The present invention combines fixed-time synchronization control related to the order of the fractional-order chaotic system with the fractional-order chaotic system to improve the efficiency and security of DNA color image encryption.

The application provides a color image encryption method based on a 1-LDCMS system and dynamic DNA coding, and the technical scheme comprises the following steps: 1. channel decomposition of an image, 2. generation of a key related to plaintext, 3. generation of a chaotic sequence and a key sequence by a 1-LDCMS system and a Chebyshev chaotic system respectively, 4. dynamic DNA operation (DNA coding, DNA addition, DNA XOR, DNA subtraction and DNA complement) of a channel matrix, 5. index scrambling, 6. DNA decoding operation, 7. XOR diffusion and merging of channel matrices, and output of a cipher image. The application can effectively improve the security and randomness of the algorithm, greatly reduce the correlation of the generated cipher image, significantly improve the information entropy, and can realize encryption by only one round of operation, thereby guaranteeing the security and real-time performance of image transmission.

The invention relates to the technical field of digital image information security, in particular to a color image encryption domain reversible information hiding method based on image block grouping. Comprising the following steps of: performing bit stream encryption on an image by using an encryption key, partitioning the image, grouping image blocks by using a grouping key, embedding information and generating an encrypted color image with embedded information; a color image is converted into a bit stream, and the bit stream and a pseudo-random sequence are encrypted through an XOR method, so that the method is simple, efficient and high in security; in the algorithm, three RGB layer image blocks are sorted and grouped together, so that the information utilization rate of a carrier image is improved; after grouping, only one image block in the group is changed according to the information to be embedded, so that the peak signal-to-noise ratio of the embedded image is improved, and the security of image content protection is improved; the error rate is lower in the process of obtaining information through correlation comparison of the image; the method is generally simple to operate and easy to implement, the calculation complexity is low, the embedded information can be correctly extracted, and the carrier image can be recovered.