Cryptanalysis of the arbitrated quantum signature protocols

Details Cryptanalysis of the arbitrated quantum signature protocols Cryptanalysis of the arbitrated quantum signature protocols

2011-06-22

arxiv.org/abs/1106.4398v1

Physical Review A 84, 022344 (2011)

Physics

Quantum Physics

7 pages, no figures

Scientific paper

10.1103/PhysRevA.84.022344

As a new model for signing quantum message, arbitrated quantum signature (AQS) has recently received a lot of attention. In this paper we study the cryptanalysis of previous AQS protocols from the aspects of forgery and disavowal. We show that in these protocols the receiver Bob can realize existential forgery of the sender's signature under known message attack. Bob can even achieve universal forgery when the protocols are used to sign a classical message. Furthermore, the sender Alice can successfully disavow any of her signatures by simple attack. The attack strategies are described in detail and some discussions about the potential improvements of the protocols are given. Finally we also present several interesting topics in future study on AQS protocols.

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