Calculation of key reduction for B92 QKD protocol

Miralem Mehic; Pavol Partila; Jaromir Tovarek; Miroslav Voznak

doi:10.1117/12.2177149

21 May 2015 Calculation of key reduction for B92 QKD protocol

Miralem Mehic, Pavol Partila, Jaromir Tovarek, Miroslav Voznak

Proceedings Volume 9500, Quantum Information and Computation XIII; 95001J (2015) https://doi.org/10.1117/12.2177149
Event: SPIE Sensing Technology + Applications, 2015, Baltimore, MD, United States

Abstract

It is well known that Quantum Key Distribution (QKD) can be used with the highest level of security for distribution of the secret key, which is further used for symmetrical encryption. B92 is one of the oldest QKD protocols. It uses only two non-orthogonal states, each one coding for one bit-value. It is much faster and simpler when compared to its predecessors, but with the idealized maximum efficiencies of 25% over the quantum channel. B92 consists of several phases in which initial key is significantly reduced: secret key exchange, extraction of the raw key (sifting), error rate estimation, key reconciliation and privacy amplification. QKD communication is performed over two channels: the quantum channel and the classical public channel. In order to prevent a man-in-the-middle attack and modification of messages on the public channel, authentication of exchanged values must be performed. We used Wegman-Carter authentication because it describes an upper bound for needed symmetric authentication key. We explained the reduction of the initial key in each of QKD phases.

Citation Download Citation

Miralem Mehic, Pavol Partila, Jaromir Tovarek, and Miroslav Voznak "Calculation of key reduction for B92 QKD protocol", Proc. SPIE 9500, Quantum Information and Computation XIII, 95001J (21 May 2015); https://doi.org/10.1117/12.2177149

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