The Security Problems in Some Novel Arbitrated Quantum Signature Protocols |
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| Authors: | Long Zhang Hong-Wei Sun Ke-Jia Zhang Qing-Le Wang Xiao-Qiu Cai |
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| Institution: | 1.School of Mathematical Science,HeiLongJiang University,Harbin,China;2.School of Computer Science and Technology,Harbin Engineering University,Harbin,China;3.Centre for Quantum Technologies,National University of Singapore,Singapore,Singapore;4.State Key Laboratory of Networking and Switching Technology,Beijing University of Posts and Telecommunications,Beijing,China;5.School of Mathematical Science,Luoyang Normal University,Luoyang,China |
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| Abstract: | With the development of quantum signature, two improved arbitrated quantum signature(AQS) protocols have been presented with different quantum encryptions. In this paper, some security loopholes during the two AQS protocols are proposed. In the enhanced arbitrated quantum signature(EAQS) protocol, though the signer is not able to deny his signature, the receiver can still forge some valid signatures. In the chaos-based arbitrated quantum signature(CAQS) protocol, the receiver can forge a valid signature without being caught, and the signer can also deny her signature after the signing phase. Finally, some potential improved ideas are discussed. |
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