2 results about "Color image encryption" patented technology

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.

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.