关键词: 混沌, 加密, 保密通信, 混沌映射

Abstract:

In order to improve the security of chaotic encryption , a dynamic encryption algorithm based on multiple chaotic mappings is proposed. In the proposed algorithm , two cascaded chaotic subsystems composed of simple chaotic mappings are adopted , and their outputs are added to the plaintext with modulus to obtain encrypted information. The iterations of the subsystems are randomly changed , so that the unpredictability of the encrypted information is enhanced. Simulation tests and security analyses show that the proposed algorithm possesses large key space , high sensitivity to plaintext and key , and excellent security against varied attacks via statistical and differential characteristics and phase space reconstruction.

Key words: chaos, encryption, secure communication, chaotic mapping