Attacking a practical quantum-key-distribution system with wavelength-dependent beam-splitter and multiwavelength sources
Attacking a practical quantum-key-distribution system with wavelength-dependent beam-splitter and multiwavelength sources
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DOI：
10.1103/physreva.84.062308
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发表时间：
2011-12-14
影响因子：
2.9
通讯作者：
Han, Zheng-Fu
中科院分区：
文献类型：
--
作者：
Li, Hong-Wei;Wang, Shuang;Han, Zheng-Fu
众所周知，量子键分布（QKD）的无条件安全性可以通过量子力学来保证。但是，实用的QKD系统具有一些缺陷，可以由窃听器控制以攻击秘密钥匙。借助当前的实验技术，由融合的双色技术制造的逼真的光束分离器具有波长依赖性属性。基于这个致命的安全漏洞，我们提出了一个依赖波长的攻击方案，该协议可以应用于具有被动状态调制的所有实用QKD系统。此外，我们通过实验攻击编码QKD系统的实用极化，以仅将量子位错误率从1.3增加到1.4％，以获取所有秘密密钥信息。
It is well known that the unconditional security of quantum-key distribution (QKD) can be guaranteed by quantum mechanics. However, practical QKD systems have some imperfections, which can be controlled by the eavesdropper to attack the secret key. With current experimental technology, a realistic beam splitter, made by fused biconical technology, has a wavelength-dependent property. Based on this fatal security loophole, we propose a wavelength-dependent attacking protocol, which can be applied to all practical QKD systems with passive state modulation. Moreover, we experimentally attack a practical polarization encoding QKD system to obtain all the secret key information at the cost of only increasing the quantum bit error rate from 1.3 to 1.4%.