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BB84 Quantum Key Distribution with Intrinsic Authentication

Authors:
Stefan Rass
Sandra König
Stefan Schauer

Keywords: Quantum Key Distribution; Authentication; BB84

Abstract:
We describe a method to authenticate the qubit stream being exchanged during the first phases of the BB84 quantum key distribution without pre-shared secrets. Unlike the conventional approach that continuously authenticates all protocol messages on the public channel, our proposal is to authenticate the qubit stream already to verify the peer's identity. To this end, we employ a second public channel that is physically and logically disjoint from the one used for BB84. This is our substitute for the otherwise necessary assumption on the existence of pre-shared secrets. Shifting authentication to the first phase of BB84 spares bandwidth during public discussion and thus makes the overall protocol also somewhat more efficient.

Pages: 41 to 44

Copyright: Copyright (c) IARIA, 2015

Publication date: August 23, 2015

Published in: conference

ISSN: 2308-3530

ISBN: 978-1-61208-431-2

Location: Venice, Italy

Dates: from August 23, 2015 to August 28, 2015