Countermeasure against probabilistic blinding attack in practical quantum key distribution systems  

作　　者：钱泳君 李宏伟 何德勇 银振强 张春梅 陈巍 王双 韩正甫 

机构地区：[1]Key Laboratory of Quantum Information,University of Science and Technology of China [2]Synergetic Innovation Center of Quantum Information & Quantum Physics,University of Science and Technology of China [3]Zhengzhou Information Science and Technology Institute

出　　处：《Chinese Physics B》2015年第9期111-115,共5页中国物理B（英文版）

基　　金：Project supported by the National Basic Research Program of China(Grant Nos.2011CBA00200 and 2011CB921200);the National Natural Science Foundation of China(Grant Nos.61475148,61201239,61205118,and 11304397);the China Postdoctoral Science Foundation(Grant No.2013M540514)

摘　　要：In a practical quantum key distribution（QKD） system, imperfect equipment, especially the single-photon detector,can be eavesdropped on by a blinding attack. However, the original blinding attack may be discovered by directly detecting the current. In this paper, we propose a probabilistic blinding attack model, where Eve probabilistically applies a blinding attack without being caught by using only an existing intuitive countermeasure. More precisely, our countermeasure solves the problem of how to define the bound in the limitation of precision of current detection, and then we prove security of the practical system by considering the current parameter. Meanwhile, we discuss the bound of the quantum bit error rate（QBER） introduced by Eve, by which Eve can acquire information without the countermeasure.In a practical quantum key distribution（QKD） system, imperfect equipment, especially the single-photon detector,can be eavesdropped on by a blinding attack. However, the original blinding attack may be discovered by directly detecting the current. In this paper, we propose a probabilistic blinding attack model, where Eve probabilistically applies a blinding attack without being caught by using only an existing intuitive countermeasure. More precisely, our countermeasure solves the problem of how to define the bound in the limitation of precision of current detection, and then we prove security of the practical system by considering the current parameter. Meanwhile, we discuss the bound of the quantum bit error rate（QBER） introduced by Eve, by which Eve can acquire information without the countermeasure.

关 键 词：countermeasure bound single-photon detector probabilistic blinding attack quantum key distribution 

分 类 号：O413[理学—理论物理] TN918.4[理学—物理]