A Novel Chaotic Image Encryption Scheme Based on Hash Function and Cyclic Shift

ABSTRACT A novel chaotic image encryption scheme based on hash function and cyclic shift is designed. The key streams are dependent on the hash value of the plain text and changed in every encryption process. The one-time keys are generated by the hash values of the plain images to get six initial values of the piecewise linear chaotic map (PWLCM). Then, the PWLCM system will produce three pseudo-random sequences to diffusion and confusion image. The mask operation and new fast ranks transformation method are used to encrypt image based on pixel level. Cycle shift is applied to the encryption system to change the position and the value of the pixels based on bit level. Many experiments are done and security analyses are discussed, which show that the novel algorithm has good effect and it can resist common attacks.

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