基于混沌映射的分组密码算法

摘要

This paper proposes a new chaotic block cipher algorithm based on a kind of extended Feistel structure which encrypts 128 bit plaintext to 128 bit cipher text. The S-box in round function is generated by logistic chaotic mapping, and puts 128 bit initial key into cubic map to generate the key of algorithm. Hardware description language of Verilog is used to design and implement the algorithm, and the encryption and decryption process are simulated by Modelsim. Experimental results show that the algorithm has high-sensitive S-box, large key space, and good performance in confusion and diffusion.%提出一种新的混沌分组密码算法.该算法基于扩展Feistel结构将128 bit明文加密为128 bit密文.轮函数中的S盒由Logistic混沌映射产生,算法密钥由128 bit的初始密钥通过Cubic映射迭代生成.采用硬件描述语言VerilogHDL设计实现该算法,并用Modelsim对加解密过程进行仿真,实验结果证明其具有高灵敏度的S盒,密钥空间大,混乱和扩散性能好.