一种动态密钥的加密算法

本文利用"周期混沌"中一定的耦合迭代映射的轨道在混沌状态间做周期性漂移的特性,提出了一种新的密钥产生办方法,把混沌行为与定期变换的密钥联系起来.首先,实现了对一个由三个一维耦合元组组成的周期混沌系统的加密解密,元组的内部动态性由Cubic方程决定;之后又实现了对内部动态性为Lorenz方程的三个三维耦合元组所组成的周期混沌系统的加密解密.实际的加密方法与Baptista一文中所用方法相似,不同的是采用了不同的混沌吸引子,由此产生的密钥也不同--密钥在加密明文字符的过程中也是定期变换的.这种方法利用了多个混沌吸引子,大大提高了加密的安全性.

Dynamic Encryption Keys Methods

In this Paper, cycling chaos, in which orbits of certain coupled iterated maps make periodic excursions between chaotic sets, is proposed as a new encryption approach that combines chaotic behavior with periodic switching of keys. First, we implement the encryption and decryption of cycling chaos system which is composed by three one - dimensional coupled cells. The internal dynamics of each cell is determined by the Cubic equation. Then we extend our method to three three - dimensional coupled cells system in which the internal dynamics of each cell is determined by Lorenz equation. The encryption and decryption of this system are also implemented. The actual encryption process is similar to the one used by Baptista, except that now different chaotic attractors, and consequently different keys, which are also periodically switched to encrypt each character of a message. This new method will greatly enhance the security of encryption, for it uses more than one chaotic attractors.