Image encryption based on multi-scrolls chaotic system and logistic map

Abstract

The chaotic image encryption has been a hot research topic for years due to its remarkable functions. However, traditional chaotic systems exist some latent problems such as insecure key source, low key space, vulnerable to known-plaintext attacks and chosen-plaintext attacks. A novel encryption algorithm based on multi-scrolls chaotic system and Logistic map is proposed in the paper. The proposed algorithm uses multi-scrolls chaotic system and Logistic map to generate key sequences, and the cipher image is obtained by performing bit shuffling to the plain image according to key sequences, then double direction diffusion operations are applied to enhance the encryption performance. Multi-scrolls chaotic system has more complex dynamic characteristics and larger key space than single-scroll and traditional chaotic systems, which can obtain better encryption performance in image encryption. The experimental results show that our method has better encryption performance and higher security, which can be applied in other secure communication domain.