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研究了有偏振漂移的量子保密系统中的截听重发攻击问题。利用二维模型刻画密钥分发的过程。通过模型分析和研究计算,得到了合法通信者以及窃听者之间的关系式,掌握了系统的探测效率损耗,以及量子误码率的波动范围。筛后数据的互信息量显示,相比BB84协议,B92协议的互信息量低,这是由于B92协议将协议所用的量子态简化为两态所付出的代价。窃听者获取的信息可能多于合法通信者得到的信息,这也将威胁密钥产生的保密性。
The problem of retransmission attacks in quantum confidential systems with polarization drift is studied. Using two-dimensional model to depict key distribution process. Through the model analysis and research calculation, the relationship between legitimate communicators and eavesdroppers is obtained, the detecting efficiency loss of the system and the fluctuating range of quantum error rate are mastered. The mutual information of the screened data shows that the mutual information of B92 protocol is lower than that of BB84 protocol, which is at the cost of reducing the quantum state used by the protocol to the two-state B92 protocol. Eavesdroppers may receive more information than legitimate correspondents, which will also threaten the secrecy of key generation.