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arXiv 2203.03250quant-ph
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量子密钥分发系统中基于公共信道的时间戳共享的密码安全问题

Cryptographic Security Concerns on Timestamp Sharing via Public Channel in Quantum Key Distribution Systems

Melis Pahalı, Utku Tefek, Kadir Durak

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6 pages, 6 figures
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摘要：

已知量子密钥分发协议易受利用用于获得密钥位的检测器响应中的时间差的侧信道攻击的攻击。针对这种定时侧信道攻击的推荐解决方案是使用大的时间仓宽度而不是高分辨率定时信息。通常的概念是，使用大的bin宽度降低了检测器响应的分辨率，因此可以最大限度地减少对窃听者的信息泄漏。我们挑战这种传统的智慧，并证明，增加bin宽度并不单调减少的关键位和窃听者的观察检测器响应之间的互信息。而不是随机增加的bin宽度，它应该仔细选择，因为互信息波动相对于bin宽度。我们还研究了探测器响应的半高宽（FWHM）对互信息的影响，并表明减小FWHM会增加互信息。最后，分仓的开始时间也被证明是重要的分仓过程和互信息周期性波动。

英文摘要：

Quantum key distribution protocols are known to be vulnerable against a side channel attack that exploits the time difference in detector responses used to obtain key bits. The recommended solution against this timing side channel attack is to use a large time bin width instead of high resolution timing information. Common notion is that using a large bin width reduces the resolution of detector responses, hence supposedly minimizes the information leakage to an eavesdropper. We challenge this conventional wisdom, and demonstrate that increasing the bin width does not monotonically reduce the mutual information between the key bits and the eavesdropper's observation of detector responses. Instead of randomly increasing the bin width, it should be carefully chosen because the mutual information fluctuates with respect to the bin width. We also examined the effect of full width half maximums (FWHMs) of the detectors responses on the mutual information and showed that decreasing the FWHM increases the mutual information. Lastly, the start time of binning is also shown to be important in binning process and the mutual information fluctuates periodically with respect to it.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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