Research on a Feedback Block Chaotic Cipher Algorithm Based on Feistel Network
一种基于Feistel网络的反馈式分组混沌密码的研究

In recent years, the application research of information security using chaos theory has become an area of active research. In this paper, we propose a novel feedback block chaotic cipher algorithm based on Feistel network. The output cipher text of current plaintext block affects the number of round that will be used in the next plaintext block and the no of S-box used by each round function is related to the secret key. The value of rounds and the sequence number of S-box are all generated dynamically by chaotic map. In addition, the nature features of chaos make the cryptosys- tern more complex and more difficult to be analyzed or predicted. Simulation results show that the proposed algorithm has excellent cryptographic properties, i. e. , the algorithm is very sensitive with respect to the small change of plaintext, secret key and the parameters of chaotic system, and the randomicity of eiphertext is very ideal. At last, the security of the algorithm is studied, and the result indicates that the algorithm proposed in this paper possesses higher ca- pability of resisting the brute-force attack.