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01-06-2017 | Issue 6/2017

Quantum Information Processing 6/2017

Analyses and improvement of a broadcasting multiple blind signature scheme based on quantum GHZ entanglement

Journal:
Quantum Information Processing > Issue 6/2017
Authors:
Wei Zhang, Daowen Qiu, Xiangfu Zou, Paulo Mateus

Abstract

A broadcasting multiple blind signature scheme based on quantum GHZ entanglement has been presented recently. It is said that the scheme’s unconditional security is guaranteed by adopting quantum key preparation, quantum encryption algorithm and quantum entanglement. In this paper, we prove that each signatory can get the signed message just by an intercept–resend attack. Then, we show there still exist some participant attacks and external attacks. Specifically, we verify the message sender Alice can impersonate each signatory to sign the message at will, and so is the signature collector Charlie. Also, we demonstrate that the receiver Bob can forge the signature successfully, and with respect to the external attacks, the eavesdropper Eve can modify the signature at random. Besides, we discover Eve can change the signed message at random, and Eve can impersonate Alice as the message sender without being discovered. In particular, we propose an improved scheme based on the original one and show that it is secure against not only the attacks mentioned above but also some collusion attacks.

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