Abstract
Very recently, an arbitrated quantum signature (AQS) scheme of classical message with an untrusted arbitrator was presented (Yang et al. in Eur. Phys. J., D, At. Mol. Opt. Plasma Phys. 61(3):773–778, 2011). In this paper, the security of the AQS scheme with an untrusted arbitrator is analyzed. An AQS scheme with an untrusted arbitrator should satisfy the unforgeable property and undeniable property. In particular, the malicious verifier can not modify a message and its signature to produce a new message with a valid signature, and the dishonest signer who really has sent the message to the verifier which the verifier accepted as an authentic one cannot later deny having sent this message. However, we show that, in the AQS scheme with an untrusted arbitrator, the dishonest signer can successfully disavow his/her signature and the malicious verifier can counterfeit a valued signature for any message by known message attack when he has received a message-signature pair. Then, we suggest an improved AQS scheme of classical message with an untrusted arbitrator which can solve effectively the two problems raised above. Furthermore, we prove the security of the improved scheme.
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Acknowledgements
This work is supported in part by the National Natural Science Foundation (Nos. 61272058, 61073054, 60873055), the Natural Science Foundation of Guangdong Province of China (Nos. 10251027501000004, S2012040007324, S2012010008833), the Specialized Research Fund for the Doctoral Program of Higher Education of China (No. 20100171110042), the Fundamental Research Funds for the Central Universities (No. 10lgzd12), the Foundation for Distinguished Young Talents in Higher Education of Guangdong Province of China (No. 2012LYM_0126), the Science and Technology Project of Jiangmen City of China (No. [2011]131), and the project of SQIG at IT, funded by FCT and EU FEDER projects QSecPTDC/EIA/67661/2006, AMDSC UTAustin/MAT/0057/2008, NoE Euro-NF, and IT Project QuantTel, FCT project PTDC/EEA-TEL/103402/2008 QuantPrivTel, FCT PEst-OE/EEI/LA0008/2011.
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Zou, X., Qiu, D. & Mateus, P. Security Analyses and Improvement of Arbitrated Quantum Signature with an Untrusted Arbitrator. Int J Theor Phys 52, 3295–3305 (2013). https://doi.org/10.1007/s10773-013-1626-z
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DOI: https://doi.org/10.1007/s10773-013-1626-z