LAUSR

Abstract This paper proposes a new high-sensitivity image encryption algorithm with random diffusion based on the spatiotemporal chaos of the Logistic-dynamic mixed linear-nonlinear coupled map lattices (LDMLNCML). The proposed LDMLNCML system possesses prominent cryptographic characteristics, which is very suitable for image encryption. The proposed image encryption algorithm adopts the strategy of random diffusion. Firstly, the pending sequence is generated according to the number of image pixels, and then two index chains are generated combining the conflict handling process. Finally, the cipher image is obtained by random diffusion. Index chains are highly sensitive to changes in position, and changes of the position of any one element will produce completely different index chains. The cipher value of each pixel in the diffusion phase depends on two random non-adjacent pixels and chaos interference value, which can greatly reduce the correlation between the adjacent pixels. Theoretical analysis and experimental results demonstrate the security and practicability of the cryptosystem.