Image Encryption using DNA Coding and Hyperchaotic System

The paper proposes a grey scale image encryption scheme using six-dimensional Lorenz chaotic system. The key generating system uses a 32 character (256 bits) key as input. The system uses simple modular arithmetic and bitwise XOR operations followed by coupling a series of Lorenz six-dimensional systems to generate the key-stream. This generated key stream is used in the encryption and decryption algorithm of the plain image. The basic permutation and diffusion architecture, using the fundamental properties of modular arithmetic, bitwise XOR operations and DNA encoding/decoding technique, are executed to confuse the relationship between plain image and the ciphered image. The experimental results and security tests confirm that the proposed image encryption algorithm possess high security and can be a good candidate for practical image encryption.