Cryptographic security concerns on timestamp sharing via a public channel in quantum-key-distribution systems

Name: Cryptographic security concerns on timestamp sharing via a public channel in quantum-key-distribution systems
Author: Pahalı, Melis, Durak, Kadir, Tefek, U.

İsim	Cryptographic security concerns on timestamp sharing via a public channel in quantum-key-distribution systems
Yazar	Pahalı, Melis, Durak, Kadir, Tefek, U.
Basım Tarihi:	2022-07
Basım Yeri	- American Physical Society
Tür	Süreli Yayın
Dil	İngilizce
Dijital	Evet
Yazma	Hayır
Kütüphane:	Özyeğin Üniversitesi
Demirbaş Numarası	2469-9926
Kayıt Numarası	3f9835c2-13f7-456c-ba5c-931ffa11bcf0
Lokasyon	Electrical & Electronics Engineering
Tarih	2022-07
Notlar	TÜBİTAK
Örnek Metin	Quantum-key-distribution protocols are known to be vulnerable against a side channel attack that exploits the time difference in detectors' 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. A common notion is that using a large bin width reduces the resolution of detectors' 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 detectors' 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 examine the effect of full width half maximums (FWHMs) of the detectors' responses on the mutual information and show that decreasing the FWHM increases the mutual information. Lastly, the start time of binning is also shown to be important in the binning process and the mutual information fluctuates periodically with respect to it.
DOI	10.1103/PhysRevA.106.012611
Cilt	106

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Cryptographic security concerns on timestamp sharing via a public channel in quantum-key-distribution systems

Yazar Pahalı, Melis, Durak, Kadir, Tefek, U.

Basım Tarihi 2022-07

Basım Yeri - American Physical Society

Tür Süreli Yayın

Dil İngilizce

Dijital Evet

Yazma Hayır

Kütüphane Özyeğin Üniversitesi

Demirbaş Numarası 2469-9926

Kayıt Numarası 3f9835c2-13f7-456c-ba5c-931ffa11bcf0

Lokasyon Electrical & Electronics Engineering

Tarih 2022-07

Notlar TÜBİTAK

Örnek Metin Quantum-key-distribution protocols are known to be vulnerable against a side channel attack that exploits the time difference in detectors' 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. A common notion is that using a large bin width reduces the resolution of detectors' 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 detectors' 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 examine the effect of full width half maximums (FWHMs) of the detectors' responses on the mutual information and show that decreasing the FWHM increases the mutual information. Lastly, the start time of binning is also shown to be important in the binning process and the mutual information fluctuates periodically with respect to it.

DOI 10.1103/PhysRevA.106.012611

Cilt 106