The chaotic systems and DNA operations are used to encrypt images jointly. The fractional Chen Chaotic System is used to generate key DNA images, and the logical map is almost applied to all encryption steps. The values of all the image pixels are first converted from decimal to quaternary, and then represented by DNA sequences. And the DNA computing methods are applied to the diffusion step between the key DNA and the DNA image converted from the plain image. Experiments can prove that the image encryption algorithm proposed by us can meet the requirements of image encryption, and can resist various attack methods, including noise attack, differential attack, etc.
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