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Given a communication system using quantum key distribution, the receiver canbe seen as one who tries to guess the sender's information just as potentialeavesdroppers do. The receiver-eavesdropper similarity thus implies a simplerelation in terms of guessing probability and correctness of sifted keys,related with the distance-based, information-theoretic security. The tolerableregions of error rates determined by such a guessing-probability-based relationare shown to be close to those determined by security criteria. Thus, analternative perspective on applying guessing probability in analyzing quantumkey distribution issues is here provided. Examples of two specific protocolsare illustrated. Our results contribute to evaluating an important element incommunication study, and may provide useful reference for the security analysisof quantum key distribution protocols.

A simple relation of guessing probability in quantum key distribution