单一基窃听方式下B92协议的安全性研究  

Security of B92 protocol related to single basis eavesdropping

作　　者：周媛媛[1] 周学军[1] 高俊[1] 

机构地区：[1]海军工程大学电子工程学院,武汉430033

出　　处：《海军工程大学学报》2009年第2期78-82,共5页Journal of Naval University of Engineering

摘　　要：从概率论和信息论两个角度对单一基窃听方式下B92协议的安全性进行了研究,得出了最佳窃听角度和信源概率分布之间的关系;以马尔柯夫串联信道模型计算了Alice和Eve之间及Alice和Bob之间的信息量,并与广义量子测量窃听进行了比较,结果表明,Eve采用单一基窃听不仅能以较高概率猜中Alice发出的量子态,并且能获得较高平均互信息。得出的结论为合法通信者的安全通信和对窃听者的检测提供了标准。The security of B92 protocol was studied in the terms of single basis with the probability and the information theory. The relation between the optimal eavesdropping angle and the signal probability was obtained. The mutual information among Alice, Bob and Eve was calculated with the theory of Markovian chain series channel. The results of comparison with the conclusion in the case of POVM eavesdropping show that Eve can guess the quantum bit with higher probability by single basis, and the average mutual information obtained by single basis is rather high. The conclusion offers a new criterion for cheking Eve.

关 键 词：量子密码术 B92协议 最佳窃听角度 互信息 

分 类 号：TN918.1[电子电信—通信与信息系统]