路径攻击对量子密钥分发网络安全性的影响

对基于微弱相干脉冲的量子密钥分发网络的安全性进行了分析.在该量子密钥分发网络中,由于光学节点的插入损耗及用户之间量子信道损耗的影响,窃听者可以实施路径攻击来获取量子信息.这种路径攻击不会改变脉冲中的光子数分布及系统的密钥生成速率,且这种窃听行为可以利用量子信道的损耗进行隐藏.数据分析显示,即使诱惑态技术也无法防范路径攻击对密钥分发网络安全的威胁,而且随着平均光子数的增加,这种威胁越强.因此,在对量子密钥分发网络系统参数进行选择时,必须考虑路径攻击的影响.

Influence of path-attack on security of quantum key distribution networks

The security of quantum key distribution(QKD) networks based on weak coherent pulses and optical node is analyzed.In this QKD network,an eavesdropper can launch a path-attack on the quantum channel to eavesdrop quantum information.Path-attack will not change quantum key generation rate and not destroy the photon number distribution in a weak coherent pulse,moreover,it can not be detected under the high quantum channel loss.The result indicates that even the decoy states skills cannot detect this kind of thr...