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Reexamining the security of fair quantum blind signature schemes |
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| Authors: | Song Lin Chao-Hua Yu Gong-De Guo |
| Affiliation: | 1. School of Mathematics and Computer Science, Fujian Normal University, Fuzhou, 350007, China 2. Computer Science Research Institute, School of Computing and Mathematics, University of Ulster, Belfast, BT37 0QB, UK 3. State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing, 100876, China 4. Key Lab of Network Security and Cryptography, Fujian Normal University, Fuzhou, 350007, China |
| Abstract: | In this paper, we reexamined the security of fair quantum blind signature protocols and found there exists a secure leakage caused by the reuse of signing key. To illustrate it, a new attack strategy is proposed based on unambiguous set discrimination of quantum state. In this attack, the attacker can forge a valid signature for any message when he owns three signatures. Finally, a feasible improved method is proposed to solve this problem. |
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