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학술지 Advanced Unambiguous State Discrimination Attack and Countermeasure Strategy in a Practical B92 QKD System
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저자
고해신, 최병석, 최중선, 윤천주
발행일
201801
출처
Quantum Information Processing, v.17 no.1, pp.1-14
ISSN
1570-0755
출판사
Springer
DOI
https://dx.doi.org/10.1007/s11128-017-1784-7
초록
Even though unconditional security of B92 quantum key distribution (QKD) system is based on the assumption of perfect positive-operator-valued measures, practical B92 systems only utilize two projective measurements. Unfortunately, such implementation may degrade the security of the B92 QKD system due to Eve's potential attack exploiting the imperfection of system. In this paper, we propose an advanced attack strategy with an unambiguous state discrimination (USD) measurement which makes practical B92 QKD systems insecure even under a lossless channel. In addition, we propose an effective countermeasure against the advanced USD attack model by monitoring double-click events. We further address a fundamental approach to make the B92 QKD system tolerable to attack strategies with USD measurements using a multi-qubit scheme.
키워드
B92 protocol, Quantum key distribution, Unambiguous state discrimination attack
KSP 제안 키워드
Attack strategy, B92 protocol, Countermeasure strategy, Projective measurements, Unambiguous state discrimination, Unconditional security, attack model, quantum key distribution