A COLOR IMAGE ENCRYPTION SCHEME WITH SYNCHRONOUS PERMUTATION-DIFFUSION STRUCTURE

Abstract

Permutation and diffusion are two basic principles in designing an image encryption algorithm.  Almost all image encryption methods are based on a scheme that separates permutation and diffusion, namely, asynchronous permutation and diffusion scheme (APDS).  This paper analyses the flaws of APDS and cracks it with a chosen plaintext attack, and then proposes a synchronous permutation-diffusion scheme (SPDS).  Experimental simulations and performance evaluations in key space, key sensibility, correlation coefficient, Shannon entropy, differential attack and data loss/noise attacks all show that the proposed scheme processes better performance compared with the APDS and some others, and can ensure a secure communication in practical applications.