| Improvement of Identity-Based Threshold Proxy Signature Scheme with Known Signors |
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| 引用本文： | LI Fagen HU Yupu CHEN Jie. Improvement of Identity-Based Threshold Proxy Signature Scheme with Known Signors[J]. 武汉大学学报:自然科学英文版, 2006, 11(6): 1653-1656 |
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| 作者姓名： | LI Fagen HU Yupu CHEN Jie |
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| 作者单位： | Key Laboratory of Computer Networks and Information Security, Ministry of Education, Xidian University, Xi＇an 710071, Shaanxi, China |
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| 基金项目： | Supported by the National Natural Science Foundation of China （60473029） |
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| 摘 要： | ![]()
In 2006, Bao et al proposed an identlty-based threshold proxy signature scheme with known signers. In this paper, we show that Bao et al＇s scheme is vulnerable to the forgery attack. An adversary can forge a valid threshold proxy signature for any message with knowing a previously valid threshold proxy signature. In addition, their scheme also suffers from the weakness that the proxy signers might change the threshold value. That is, the proxy signers can arbitrarily modify the threshold strategy without being detected by the original signer or verifiers, which might violate the original signer＇s intent. Furthermore, we propose an improved scheme that remedies the weaknesses of Bao et al＇s scheme. The improved scheme satisfies all secure requirements for threshold proxy signature.
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| 关 键 词： | 信息安全 密码术 代理签名 双线性配对 |
| 文章编号： | 1007-1202（2006）06-1653-04 |
| 收稿时间： | 2006-05-20 |
Improvement of Identity-Based Threshold Proxy Signature Scheme with Known Signors |
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| Abstract: | ![]()
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| Keywords: | identity-based cryptography threshold proxy signature bilinear pairings |
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