一次一密体制的安全性分析与改进

Security Analysis of One-time System and Its Betterment

由于仙农证明一次一密具有完善保密性,一次一密体制一直以来被认为是不可攻破的。作者分析了仙农在证明一次一密体制完善保密过程中一些暗含的前提与错误,指出了其中对Baye8定理的误用,错误在于把不同的前提条件下的概率混淆带入了Bayes定理的等式中,并且对一次一密提出了改进方法。

As Shannon had proved that one-time system is perfect secrecy,one-time system is deemed to be un- breakable.The paper analyzes the implied presupposition and mistake in Shannon s attestation.it is pointed out that Bayes theorem was used mistakenly in his proof because of his mixing up the probabilities under different con- ditions.At the same time betterment of one-time system is provided.