On the "Security analysis and improvements of arbitrated quantum signature schemes"

Details On the "Security analysis and improvements of arbitrated quantum signature schemes" On the "Security analysis and improvements of arbitrated quantum signature schemes"

2011-05-06

arxiv.org/abs/1105.1232v1

Physics

Quantum Physics

Scientific paper

Recently, Zou et al. [Phys. Rev. A 82, 042325 (2010)] pointed out that two arbitrated quantum signature (AQS) schemes are not secure, because an arbitrator cannot arbitrate the dispute between two users when a receiver repudiates the integrity of a signature. By using a public board, they try to propose two AQS schemes to solve the problem. This work shows that the same security problem may exist in their schemes and also a malicious party can reveal the other party's secret key without being detected by using the Trojan-horse attacks. Accordingly, two basic properties of a quantum signature, i.e. unforgeability and undeniability, may not be satisfied in their scheme.

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