| Provably Secure Convertible Directed Partially Blind Signatures |
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| 作者姓名： | HUANG Zhenjie CHEN Kefei WANG Yumin |
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| 作者单位： | [1]School of Electronic, Information and ElectricalEngineering, Shanghai Jiao Tong University, Shanghai 200030,China; [2]State Key Laboratory of Information Security, Institute ofSoftware, Chinese Academy of Sciences, Beijing 100080, China; [3]State Key Laboratory of Integrated Service Networks,Xidian University, Xi＇an 710071, Shaanxi, China |
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| 基金项目： | Foundation Item： Supported by the Innovation Foundation for Young Technological Talents of Fujian Province （2005J055）, the Science and Technology Program of Department of Educatuon of Fujian Province （JA04250） and the Natural Science Foundation of Fujian Province |
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| 摘 要： | Combining the concept of partially blind signature with the concept of directed signature, we introduce a new concept of convertible directed partially blind signature （CDPBS）, in which only the signer and the user can verify, confirm and disavow the validity of given signatures and convert given signatures into universally verifiable ones, to meet the need of signing personally or commercially sensitive messages. We give a formal definition of CDPBS and propose a concrete provably secure CDPBS scheme. The proposed scheme is efficient and secure, in which its unforgeability is the same as that of the Schnorr＇s signature scheme and its untransferability relies on the hardness of the decisional Diffie-Hellman problem. Furthermore, by letting the user＇s private key be a common constant, the proposed scheme can be used as a normal partially blind signature scheme.
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| 关 键 词： | 计算机 安全技术 数字信号 密码 加密技术 |
| 文章编号： | 1007-1202（2007）01-0055-04 |
| 收稿时间： | 2006-05-20 |
Provably secure convertible directed partially blind signatures |
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| HUANG Zhenjie CHEN Kefei WANG Yumin.Provably Secure Convertible Directed Partially Blind Signatures[J].Wuhan University Journal of Natural Sciences,2007,12(1):55-58. |
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| Authors: | Huang Zhenjie Chen Kefei Wang Yumin |
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| Institution: | (1) School of Electronic, Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China;(2) State Key Laboratory of Information Security, Institute of Software, Chinese Academy of Sciences, Beijing, 100080, China;(3) State Key Laboratory of Integrated Service Networks, Xidian University, Xi’an, 710071, Shaanxi, China |
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| Abstract: | Combining the concept of partially blind signature with the concept of directed signature, we introduce a new concept of convertible
directed partially blind signature (CDPBS), in which only the signer and the user can verify, confirm and disavow the validity
of given signatures and convert given signatures into universally verifiable ones, to meet the need of signing personally
or commercially sensitive messages. We give a formal definition of CDPBS and propose a concrete provably secure CDPBS scheme.
The proposed scheme is efficient and secure, in which its unforgeability is the same as that of the Schnorr’s signature scheme
and its untransferability relies on the hardness of the decisional Diffie-Hellman problem. Furthermore, by letting the user’s
private key be a common constant, the proposed scheme can be used as a normal partially blind signature scheme.
Biography: HUANG Zhenjie(1964–), male, Professor, Ph. D., research direction: digital signatures and their applications. |
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| Keywords: | cryptography digital signature partially blind signature directed signature convertible |
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