8 results about "Color image encryption" patented technology

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 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 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 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 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.