Cryptanalysis of a chaos-based image encryption scheme combining DNA coding and entropy

An image encryption scheme based on chaos system combining with DNA coding and information entropy has been proposed recently, in which chaos system and DNA operation are used to perform substitution, and entropy driven chaos system is used to perform permutation. However, two vulnerabilities are found and presented in this paper, which make the encryption fail under chosen-plaintext attack. A complete chosen-plaintext attack algorithm is given to rebuild chaos systems’ outputs and recover plain image, and its efficiency is demonstrated by analysis and experiments. Further, some improvements are proposed to make up these vulnerabilities and enhance the security.

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