Abstract
This paper proposes a new chaotic image encryption, which is based on the coupled map lattices (CML system) and DNA diffusion sequences, and it's also a new one-time pad scheme. The initial values and control parameters of the CML system and logistics map are served as keys for one-time pad and calculated by utilizing the SHA-256 hash algorithm and the plaintext. In the pixel level, we utilize the CML system and sort function to encrypt according to the way from diffusion to scrambling; each pixel is encrypted by randomly DNA encoding, it means that a pixel consists of 4 bases in the DNA level; the Hamming distance and cyclic shift function are utilized to scramble, and the DNA encoding rules, the DNA complementary rules, the DNA operation rules and other operations are combined with the chaotic map for the diffusion process. Security analysis shows that the new algorithm has good security and can resist common attacks.
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