An Adaptive Image Encryption Scheme Using Fractal Dynamical System and DNA Operations

Abstract

The chaotic natures of a new fractal dynamical system have been investigated experimentally and used to yield chaotic sequences to design cryptosystems. An adaptive permutation-diffusion mechanism is introduced to achieve strong resistance against chosen/known plaintext attacks. Plain image related chaotic sequences are generated to shuffle the positions of pixels in the permutation stage. In the diffusion process, DNA coding, decoding operations and diffusion function are proposed to alter the pixels' gray values. The security and performance analysis, such as histogram analysis, correlation analysis, entropy analysis, differential analysis, have been done. The simulation results show that the proposed cryptosystem is secure enough for practical application.