DNA dynamic coding based colored image encryption method

Abstract

The present invention relates to a DNA dynamic coding based colored image encryption method, comprising: obtaining a key through a colored plain-text image; by the key, calculating an initial value and a parameter of a chaotic system used in scrambling and diffusion processes; substituting the initial value and the parameter to the chaotic system for iteration to obtain W1 and W2, obtaining a scrambling matrix K from W1, obtaining an integer matrix Y and an index matrix Ind from W2, and performing DNA coding on Y according to the index matrix Ind; and performing scrambling on the plain-text image row by row by using the matrix K, then performing coding and diffusion until all rows finish DNA coding, and finally performing decoding and recomposing on a DNA matrix, to obtain a final colored ciphertext image. According to the method, a function SHA256 is used to generate the key, so that the key space is expanded; the generation of the key depends on a plain-text, so that plain-text attack can be effectively resisted; chaotic characteristics are combined with DNA dynamic coding, so that the security is further improved; and meanwhile, scrambling and diffusion operations are performed according to the row of images, so that parallel computing is facilitated and the efficiency is improved.

Description

technical field [0001] The invention relates to a color image encryption method, in particular to a color image encryption method based on DNA dynamic coding. Background technique [0002] In today's information age, the use of computers and various smart terminals has greatly accelerated the dissemination of information, and the transmission of most information in our lives, such as documents, audio, video, especially image information, is far from Do not open network support. On the one hand, the network brings convenience to people's life, but on the other hand, some criminals will use the network to steal information, which brings great hidden dangers to people's information security, so the security and safety of information in the process of network transmission Confidentiality issues are also more and more people's attention and attention. Due to the characteristics of randomness, determinism, ergodicity and high sensitivity to initial values, chaotic systems have b...

AI Technical Summary

Problems solved by technology

However, most of the existing DNA-based encryption algorithms need to be operated in biological experiments. Due to the expensive biological experimental equipment, the difficulty in controlling the experimental environment, and the high sensitivity of the experiment, the encryption methods based on DNA cryptography are more theoretical than practical. Most of the currently known DNA-based encryption algorithms are mainly aimed at text information or grayscale image information. Considering the correlation between the RGB components of color images, they cannot be directly extended to the encryption of color images.

In addition, in the currently proposed image encryption algorithm that combines DNA coding and chaotic characteristics, the selected DNA coding rules are fixed, and because there are only 8 kinds of DNA coding rules, the ability of the algorithm to resist exhaustive attacks is very weak. In addition, many algorithms lack the connection with plaintext, which leads to their weak ability to resist plaintext attacks, which can easily lead to the leakage of image information

Images