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分析了Shor和Preskill证明BB84量子密钥分配协议无条件安全性的方法 ,指出不能用Shor Preskill方法直接证明B92量子密钥分配协议的无条件安全性。同时借鉴Shor Preskill方法 ,引入一种将B92协议转化为BB84协议的变换 ,通过证明该变换过程不会泄漏密钥信息给窃听者 ,以此证明B92协议的无条件安全性 .也解决了Lo等人提出的关于用Shor Preskill方法证明B92协议的困难 .
The method of Shor and Preskill proving the unconditional security of BB84 quantum key distribution protocol is analyzed. It is pointed out that Shor Preskill method can not directly prove the unconditional security of B92 quantum key distribution protocol. At the same time, Shor Preskill method is introduced to introduce a transform that transforms the B92 protocol into a BB84 protocol, which proves the unconditional security of the B92 protocol by proving that the transformation process does not leak the key information to the eavesdropper. The proposed difficulty with the Shor Preskill method to prove the B92 protocol.