对“一种超混沌图像加密算法的安全性分析及其改进”的选择明文攻击

摘要

This paper introduced chosen plaintext attack. The target of the attack was an image encryption algorithm based on a hyper chaotic system whose disadvantages were vulnerable encryption methods of choosing elementary transformation and ex-clusive-or operation. Attack algorithm in which three characteristic plaintext matrices were given and the encryption key was unknown was utilized to attack the target algorithm. According to the result, chosen plaintext attack can decode this algorithm.%针对一种改进的超混沌图像加密算法进行攻击.该算法利用超混沌系统对像素矩阵的初等变换实现像素置乱,并将像素置乱后的矩阵与超混沌系统的不同组合进行异或运算实现图像扩散.由于该算法采用易被攻击的矩阵初等变换和异或运算的加密措施,使其很难抵抗各种攻击.选择三个各具特点的明文矩阵,在未知加密密钥的前提下对该算法进行选择明文攻击.仿真结果表明对该算法实现了选择明文攻击.