A chaotic image encryption scheme owning temp-value feedback

Many round-based chaotic image encryption algorithms employ the permutation-diffusion structure. Schemes using this structure have been found insecure when the iteration round is equal to one and the secret permutation of some existing ones can be recovered even a higher iteration round is adopted. In this paper, we present a single round permutation-diffusion chaotic cipher for gray image, in which some temp-value feedback mechanisms are introduced to resist the known attacks. Specifically, we firstly embed the plaintext feedback technique in the permutation process to develop different permutation sequences for different plain-images and then employ plaintext/ciphertext feedback for diffusion to generate equivalent secret key dynamically. Experimental results show that the suggested scheme owns large key space and can resist the differential attack. It is also efficient.