关键词: 混沌, Logistic映射, Tent映射, 混沌加密, 互反馈

Abstract: In order to increase the security of the low dimensional chaotic encryption system while not affecting the performance, a composite chaotic encryption system based on Logistic mapping and Tent mapping was presented. Firstly, the secret-key sequences were generated based on two mapping with mutual feedback, which was used to encrypt the plaintext; at the same time, the number of chaotic iterations was changed through cipher-feedback, and the iterative process has certain randomness. The results show, compared with single Logistic chaotic encryption, the algorithm not only has a large key space, high encryption intension and good operation efficiency of low dimensional chaotic encryption system, but also can resist brute-force attack, statistical attack and phase diagrams attack effectively.

Key words: chaos, Logistic mapping, Tent mapping, chaotic encryption, mutual feedback