摘要：

对一个基于混沌反馈模型图像加密算法的安全性进行了分析，利用加密算法中密钥在乱数中扩散的不完全性，给出了一个分割攻击方法，证明了该方法的穷举复杂度为221，成功率为1，将密钥熵降低了235bit。因此该加密算法是不安全的。

关键词: 密码分析, 已知明文攻击, 分割攻击, 反馈模型, Logistic映射

Abstract: This paper analyzes the security of the chaos-based feedback cryptographic scheme of human video objects and gives a divide-and-conquer attack algorithm against it by using the incompleteness of which the key information diffuses in keystreams. The exhaustive complexity is 221 and the success rate of the attack algorithm is 1. The decrease of key entropy is 235bits. So this encryption algorithm is insecure.

Key words: cryptanalysis, known-plaintext attack, divide-and-conquer attack, feedback model, Logistic map

中图分类号: 

• TP918