对一种混沌图像密码的选择明文攻击
Chosen-plaintext Attack on a Chaotic Image Cipher
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摘要: 对基于广义猫映射和加法模运算的混沌密码进行了安全性分析,指出了该密码设计上的几处瑕疵。在选择明文攻击下,该密码系统在1轮加密时不够安全,仅选择3幅明文图像就可破译。讨论了该密码在多轮加密时待解决的问题以及可能采取的改进措施。Abstract: The security of the chaotic cryptosystem based on general cat map and additive modular arithmetic is studied.Several weaknesses of the cipher are pointed out.By choosing three plaintexts,the one-round cryptosystem can be broken.The problems to be solved in the cryptosystem and possible improved methods are discussed.
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