复合量子密钥分发系统双速协议及其安全性分析

基于真空光速c是极限信号速度这一基本假设,提出了复合量子密钥分发(QKD)系统和双速协议,并证明双速协议的安全性与原BB84协议的安全性相同.结果表明,双速协议在将量子密钥生成效率从50%提高到100%的同时,还降低了窃听者Eve可能得到的信息量.双速协议由于打破了公开讨论之前Bob和Eve的对等地位,使QKD在概念上有了明显的改进,使协议基的选择空间有了本质性的扩充.具体给出了三个双速协议的实例,并详细分析了它们在截取重发攻击下的安全性 关键词： 量子密码 光纤量子密钥分发 双速协议

Dual-velocity protocol of hybrid QKD system and its security analysis

Based on the hypothesis that the velocity of light in vacuum is the maximum velocity possible for any signal, we present a dual velocity protocol for a hybrid quantum key distribution (QKD) system, and prove that its security is the same as that for the BB84 protocol. We show that this protocol can improve the efficiency of quantum key generation from 50% to 100%, and, at the same time, reduce Eve's information. Because it breaks the symmetry between Bob and Eve before open discussion, the dual velocity protocol extends the concept of QKD and increases our choice of protocol bases. We present three application examples and analyze in detail their security under intercept/resend attacks.