一次一密体制的安全局限性及其根源分析  

Analysis of Secure Limitation of One-Time System and Its Origin

作　　者：王勇[1] 

机构地区：[1]桂林电子科技大学计算机与控制学院,广西桂林541004

出　　处：《电子科技》2008年第1期71-75,共5页Electronic Science and Technology

基　　金：广西自然科学基金(0640171);现代通信国家重点实验室基金(9140C1101050706)

摘　　要：从多个角度分析了仙农在证明一次一密体制完善保密过程中一些错误,指出了其中对Bayes定理的错误利用,错误在于把不同的前提条件下的概率混淆代入了Bayes定理的等式中,并且通过举例证实了错误。同时指出一次一密体制依然具有很好的安全特性。对相关的一些反对看法进行了剖析,并且从信息论和概率论的角度分析了错误的根源。This paper analyses the mistakes in Shannon＇s attestation to prove that one - time system is perfect security. Bayes＇theorem was used wrongly in his proof, for he mixed up the probabilities under different conditions and took them into the equation of Bayes~ theorem. The mistakes are pointed out with examples. It is admitted that one - time pad still possesses good security characteristic and the opposition views are analyzed and origin of their mistakes is discussed from the perspective of information theory and theory of probability.

关 键 词：一次一密体制 密码学 完善保密 信息论 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]