改进的空间模式随机化量子密钥分发系统  

Improved quantum key distribution system based on spatial modes randomization

作　　者：刘欣[1,2,3] 韩宇 李宏欣 王伟[1] 王洪[2,3] 马智[2,3] LIU Xin1,2,3, HAN Yu1 , LI Hong-xin1,2,3, WANG Wei1 , WANG Hong2,3, MA Zhi2,3(1.Department of Postgraduates Administration, PLA University of Foreign Language, Luoyang 471000, China; 2. Academy of Cyberspace Security, Information Engineering University, Zhengzhou 450002, China; 3. State Key Laboratory of Mathematical Engineering and Advanced Computing, Information Engineering University, Zhengzhou 450002, Chin)

机构地区：[1]解放军外国语学院研究生管理大队,河南洛阳471000 [2]信息工程大学网络空间安全学院,河南郑州450002 [3]信息工程大学数学工程与先进计算国家重点实验室,河南郑州450002

出　　处：《计算机工程与设计》2018年第6期1506-1515,共10页Computer Engineering and Design

摘　　要：为提高系统的安全性,对基于空间模式随机化的探测模型提出两点改进措施。为使系统能够动态适应随机化过程,模式选择随机化模块在系统中引入可以产生无偏置序列的量子随机数发生器;端口符号定义随机化保证攻击者无法得知信号最终会在哪个探测器引起响应,避免大多数针对探测器效率不匹配的攻击。给出改进后模型的实验装置及安全性证明,通过分析可知,当对光脉冲进行强光攻击的比例大于0.1时,改进方案中Eve获得的信息量始终少于原方案;当该比例为0.7左右时,改进方案与原方案相比Eve获得信息的减少量达到最大。To improve the security of the previous randomization pattern,two schemes were proposed.To make the system able to adapt to the randomizing process dynamically,the quantum random number generator that generated series number without deviation was introduced.Randomization for port symbol definition made it unavailable for most of the attacks aiming at the mismatch of the detection efficiency.Because it was impossible for the attackers to know the detection events so that they were unable to access the secret key.The improved system with its security analysis was particularly demonstrated.The information that Eve can get is always less in the improved system than that in the original system when the fraction of the intercepted pulses is above 0.1 and the decrement of the information that Eve can get is maximized when the rate equals to 0.7 through analysis.

关 键 词：量子密码 实际安全性 端口符号定义随机化 空间模式随机化 安全性分析 

分 类 号：TN911[电子电信—通信与信息系统]