一种基于Feistel结构混沌分组密码的研究

Study on Chaotic Block Cipher based on Feistel Structure

混沌系统具有良好的伪随机性、混频特性、对初始状态的敏感性、复杂的映射参数等特性,这些特性与密码学要求的产生伪随机信号、混乱和扩散、加解密密钥的难以预测等属性十分吻合。文中针对一种较新的基于Feistel结构的混沌分组密码,应用线性密码分析方法,分别在固定S盒、动态S盒两种情况对该算法进行了分析,并进行了大量的仿真测试。分析测试结果表明,相比较于传统分组密码,该混沌分组密码能够更有效地抵抗线性密码攻击,性能良好。

Chaos system has many excellent properties, including pseudo random, frequency mixing, sensitivity of the initial value, and complex mapping parameters, these properties are quite consistent with the requirements by cryptography, such as production of pseudo-random signal, confusion and diffusion, difficult prediction of encryption/ decryption keys. A new chaotic block cipher algorithm based on Feistel structure with fixed S-box and dynamic S-box is analyzed with linear cryptanalysis method, and various simulation tests indicate that compared with traditional block cipher, the block cipher based on chaos is more resistant to linear cryptanalysis, and has much better performance.