A RGB image encryption technique using Lorenz and Rossler chaotic system on DNA sequences

摘要

In this paper, a robust color image encryption system using Lorenz-Rossler chaotic map is proposed. The proposed encryption system uses hybrid of two chaotic systems namely Lorenz and Rossler to generate the random sequence. These generated sequences are used for encryption of red, green and blue channels of color image. Rules of DNA cryptosystem are used to encode the plain image in proposed approach. Cross channel operation is proposed to increase randomness in plain image. The proposed encryption approach is tested over different well-known images that are taken from USC-SIPI image dataset. Its performance is compared with recently developed eight image encryption techniques. The experimental results reveal that the proposed approach performs better than the existing techniques in terms of correlation coefficient. The security analyses such as statistical analysis and key sensitivity analysis are performed to validate the security of proposed encryption approach. The key space of proposed approach is large enough to resist against brute force attacks.