摘要： 针对一个基于混沌序列的加密方案在已知图像条件下的安全性，通过分析加密算法在使用过程中的特性，给出其信息泄漏规律。基于该规律，给出求解加密方案等效密钥的攻击算法及其具体步骤，分析算法的计算复杂性。理论与实验证明，该加密算法对于已知图像攻击是不安全的。

关键词: 混沌密码, 已知图像攻击, 图像加密算法, 吻合度

Abstract: To study the security with known image of a chaotic stream image encryption algorithm, this paper gives the rule of information leakage by analyzing the property of the algorithm functions, and designs attack algorithm based on the rule. The equivalent key of the encryption algorithm can be found by attack algorithm, and the computing complexity of the attack is given. It is proved that the encryption algorithm is insecure for known-image attack.

Key words: chaotic cipher, known-image attack, image encryption algorithm, coincidence degree

中图分类号: 

• TN918.1