Coherent eavesdropping strategies for the 4-state quantum cryptography protocol

Preprint

31 January 1997

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.quant-ph/9702002

Abstract

An elementary derivation of best eavesdropping strategies for the 4 state BB84 quantum cryptography protocol is presented, for both incoherent and two--qubit coherent attacks. While coherent attacks do not help Eve to obtain more information, they are more powerful to reveal the whole message sent by Alice. Our results are based on symmetric eavesdropping strategies, which we show to be sufficient to analyze these kind of problems.

Keywords

QUANTUM CRYPTOGRAPHY PROTOCOL
EAVESDROPPING STRATEGIES
COHERENT EAVESDROPPING
COHERENT ATTACKS
STATE QUANTUM
MESSAGE

All Related Versions

Version 1, 1997-01-31, ArXiv
Published version: Physics Letters A, 229 (1), 1.

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