Laser Physics, 2014, Volume 24, Issue 2, Pages 25202–4
A simple coherent attack and practical security of differential phase shift quantum cryptography
D. A. Kronberg
Faculty of Computational Mathematics and Cybernetics, Moscow State University, Moscow, 119899, Russia
The differential phase shift quantum key distribution protocol reveals good security against such powerful attacks as unambiguous state discrimination and beam splitting attacks. Its complete security analysis is complex due to high dimensions of the supposed spaces and density operators. In this paper, we consider a particular and conceptually simple coherent attack, available in practical implementations. The main condition for this attack is the length of used coherent state tuples of order 8–12. We show that under this condition, no high level of practical distance between legitimate users can be achieved.
|Russian Foundation for Basic Research
|The author is grateful to Professor S N Molotkov for constant attention to this work. The research was partially supported by RFBR grants 12-02-31200, and 11-02-00455.
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