A chaos-based image encryption algorithm using alternate structure

作者：Zhang Yiwei^*; Wang Yumin; Shen XuBang

来源：Science in China - Series F: Information Sciences , 2007, 50(3): 334-341.

DOI：10.1007/s11432-007-0026-5

• chaotic encryption
• general cat-map
• OCML
• image encryption

Combined with two chaotic maps, a novel alternate structure is applied to image cryptosystem. In proposed algorithm, a general cat-map is used for permutation and diffusion, as well as the OCML (one-way coupled map lattice), which is applied for substitution. These two methods are operated alternately in every round of encryption process, where two subkeys employed in different chaotic maps are generated through the masterkey spreading. Decryption has the same structure with the encryption algorithm, but the masterkey in each round should be reversely ordered in decryption. The cryptanalysis shows that the proposed algorithm bears good immunities to many forms of attacks. Moreover, the algorithm features high execution speed and compact program, which is suitable for various software and hardware applications.

• 出版日期2007-6
• 单位西安电子科技大学