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postgraduate thesis: Improved secure key rate for the decoy state protocol in the finite key regime
Title | Improved secure key rate for the decoy state protocol in the finite key regime |
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Authors | |
Advisors | |
Issue Date | 2019 |
Publisher | The University of Hong Kong (Pokfulam, Hong Kong) |
Citation | Ng, K. C. J. [伍國頌]. (2019). Improved secure key rate for the decoy state protocol in the finite key regime. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. |
Abstract | The quantum key distribution is a promising candidate for an unconditionally secure secret communication between two parties. However, due to imperfections in the reality---more specifically, a lossy channel and the near impossibility of a single-photon generating device, its security in practical application could be undermined by various attacks, such as the photon-splitting attack. The decoy state method offers an efficient way to combat this attack, thus significantly increasing the security of quantum key distribution. Previous analyses mostly focused on three intensities, and the key rates were calculated in the asymptotic key length regime. Recently, decoy state method calculations are generalized to arbitrary number of intensities, and an efficient method of evaluation of the key rate has been devised with the use of McDiarmid inequality. In this thesis, three new methods are presented based on the further use of McDiarmid inequality. These are based on extensions of the inequality and different ways of its implementation. The Monte Carlo method is applied to numerically calculate the improved key rates. The results show a few percents of improvement compared to the old key rates. These improved key rates allow a more robust secret key communication and make the decoy-state protocol more practical. |
Degree | Master of Philosophy |
Subject | Quantum communication - Security measures Cryptography Data encryption (Computer science) |
Dept/Program | Physics |
Persistent Identifier | http://hdl.handle.net/10722/281515 |
DC Field | Value | Language |
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dc.contributor.advisor | Chau, HF | - |
dc.contributor.advisor | Zhang, S | - |
dc.contributor.author | Ng, Kwok Chung Joseph | - |
dc.contributor.author | 伍國頌 | - |
dc.date.accessioned | 2020-03-14T11:03:34Z | - |
dc.date.available | 2020-03-14T11:03:34Z | - |
dc.date.issued | 2019 | - |
dc.identifier.citation | Ng, K. C. J. [伍國頌]. (2019). Improved secure key rate for the decoy state protocol in the finite key regime. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. | - |
dc.identifier.uri | http://hdl.handle.net/10722/281515 | - |
dc.description.abstract | The quantum key distribution is a promising candidate for an unconditionally secure secret communication between two parties. However, due to imperfections in the reality---more specifically, a lossy channel and the near impossibility of a single-photon generating device, its security in practical application could be undermined by various attacks, such as the photon-splitting attack. The decoy state method offers an efficient way to combat this attack, thus significantly increasing the security of quantum key distribution. Previous analyses mostly focused on three intensities, and the key rates were calculated in the asymptotic key length regime. Recently, decoy state method calculations are generalized to arbitrary number of intensities, and an efficient method of evaluation of the key rate has been devised with the use of McDiarmid inequality. In this thesis, three new methods are presented based on the further use of McDiarmid inequality. These are based on extensions of the inequality and different ways of its implementation. The Monte Carlo method is applied to numerically calculate the improved key rates. The results show a few percents of improvement compared to the old key rates. These improved key rates allow a more robust secret key communication and make the decoy-state protocol more practical. | - |
dc.language | eng | - |
dc.publisher | The University of Hong Kong (Pokfulam, Hong Kong) | - |
dc.relation.ispartof | HKU Theses Online (HKUTO) | - |
dc.rights | The author retains all proprietary rights, (such as patent rights) and the right to use in future works. | - |
dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. | - |
dc.subject.lcsh | Quantum communication - Security measures | - |
dc.subject.lcsh | Cryptography | - |
dc.subject.lcsh | Data encryption (Computer science) | - |
dc.title | Improved secure key rate for the decoy state protocol in the finite key regime | - |
dc.type | PG_Thesis | - |
dc.description.thesisname | Master of Philosophy | - |
dc.description.thesislevel | Master | - |
dc.description.thesisdiscipline | Physics | - |
dc.description.nature | published_or_final_version | - |
dc.date.hkucongregation | 2020 | - |
dc.identifier.mmsid | 991044216928703414 | - |