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弱密钥问题是混沌密码系统设计中的关键问题,已有研究主要从混沌序列退化角度进行分析.然而,本文指出保证混沌序列不退化的密钥参数仍可能构成混沌密码的弱密钥.本文提出以混沌密码序列随机性作为评价标准,应用严格的统计检验方法对混沌密码的弱密钥进行检测.进一步,对一类混沌密码系统进行了弱密钥研究,检测出了该系统大量未被发现的弱密钥.这确证了所提出方法的有效性.另一方面,虽然已有较多研究采用统计检验对混沌比特序列进行测试,但将统计检验用于分析混沌密码弱密钥或弱序列的研究还很少见.本文给出的统计检验弱序列分析,对当前混沌密码统计检验研究是一个很好的补充.
Weak key problem is the key problem in the design of chaotic cryptosystem, and the existing researches mainly analyze from the angle of chaos sequence degeneration.However, it is pointed out that the key parameter that can guarantee the chaos sequence not degenerate may still constitute the weak key of chaos cryptosystem. In this paper, the stochastic random sequence of chaotic cryptosystems is taken as the evaluation criterion, and a strict statistic test is used to detect the weak key of chaotic cryptosystem.Finally, we study the weak key of a chaotic cryptosystem and find out that the system is not This confirms the effectiveness of the proposed method.On the other hand, although more studies have used statistical tests to test chaotic bit sequences, we use statistical tests to analyze weak or weak chaotic keys Sequence research is still rare .This article gives a statistical test of weak sequence analysis, the current chaos password statistical test is a good supplement.