一阶双曲构建分组大小可变的分组密码

Variable Size Block Cipher Based on First-Order Hyperbolic Equations

提出基于一阶双曲方程混合初边值问题构建分组大小可变的分组密码(VSBC)的方法.系统中使用矩阵方程进行加密/解密,矩阵方程由偏微分方程的差分格式得到,矩阵的大小可随信息大小变化,矩阵元素在加密/解密过程中随时间变化.实验表明VSBC有一些突出的优点,比如分组大小可变、密钥空间大、密钥的管理和传输方便.

This paper is devoted to design a variable size block cipher（VSBC） based on the first-order hyperbolic equation with mixed initial-boundary conditions.In the VSBC,encryption/decryption is completed by using matrix transformation.Size of the matrixes which due to the difference schemes of PDE models can change with size of message and time during encryption or decryption.Experiment results show that the VSBC has some advantage attributes,for example,the variability of block size,the sufficiency of keyspace and the convenience of keys management and transmission.