AN IMAGE ENCRYPTION USING BIT LEVEL PERMUTATION AND DEPENDENT DIFFUSION?

Chaos-based cryptosystems have been studied extensively due to their superior properties in security and complexity. Recently, quite a lot of chaos-based image encryption schemes have been proposed. Most of them adopt the traditional permutation and diffusion operations. The drawbacks are: the architecture is not sensitive to changes in the plain-image and they are insecure upon chosen/known plainimage attack. Due to the favourable properties of bit-level permutation, we propose a bit-level confusion and dependent diffusion to enhance the security of the cryptosystem and to reduce the computation redundancy in traditional architectures. Simulations have been carried out and the results demonstrate the superior security and high efficiency of the proposed scheme.