一种用于量子密钥分发系统的脉冲光致盲攻击防御方案

A defense scheme of pulse illumination attack for quantum key distribution systems

在量子密钥分发系统中,强光致盲攻击利用单光子探测器在实际工作中可能存在因强光导致的线性探测模式,实现对单光子探测器输出0或1的控制,从而实施密钥窃取。针对前人提出的新型脉冲光致盲攻击方案可能存在的漏洞,提出了一种基于分光检测的脉冲光致盲攻击防御方案。在现行通过检测器件工作电流大小来判断是否有强光攻击存在的防御措施基础上,该方案在单光子探测器被致盲之前实现强脉冲光的100%检测,从而关闭脉冲光致盲攻击的检测漏洞,提升量子密钥分发系统的安全性。

In quantum key distribution systems,bright light blinding attack makes use of the detection characteristics of linear mode caused by bright light in the actual work of single-photon detectors to control the output of single-photon detectors to be 0 or 1,so as to implement key stealing.To address the potential vulnerabilities of the new type of pulse illumination attack scheme proposed by previous researchers,a defense scheme against the detector blinding attack by pulse illumination based on beam split detection is presented.Based on the countermeasures of detecting the working current of the device to judge whether there is a blinding attack,this scheme realizes the detection of bright light pulse with 100%probability before the detector is blinded,therefore,it can close the detection loophole of pulse illumination attack and improve the security of quantum key distribution systems.