| Identity-based threshold signature and mediated proxy signature schemes |
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| 作者姓名： | YU Yong YANG Bo State Key Laboratory of ISN Xidian University Xi’an China SUN Ying College of information South China Agricultural University Guangzhou China |
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| 作者单位： | YU Yong YANG Bo State Key Laboratory of ISN，Xidian University，Xi’an 710071，China SUN Ying College of information，South China Agricultural University，Guangzhou 510642，China |
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| 摘 要： | Proxy signature schemes allow an original signer to delegate his signing rights to a proxy signer. However, many proxy signature schemes have the defect which is the inability to solve the proxy revocation problem. In this article, we firstly propose an identity-based threshold signature scheme and show that it has the properties of unforgeability and robustness. In our threshold signature scheme, we adopt such a method that the private key associated with an identity rather than the master key is shared. Then, based on the threshold signature scheme, an identity-based mediated proxy signature scheme is proposed where a security mediator (SEM) is introduced to help a proxy signer to generate valid proxy signatures, examine whether a proxy signer signs according to the warrant, and check the revocation of a proxy signer. It is shown that the proposed scheme satisfies all the security requirements of a secure proxy signature. Moreover, a proxy signer must cooperate with the SEM to generate a valid proxy signature, which makes the new scheme have an effective and fast proxy revocation .
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| 收稿时间： | 18 September 2006 |
Identity-based threshold signature and mediated proxy signature schemes |
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| YU Yong,YANG Bo,SUN Ying.Identity-based threshold signature and mediated proxy signature schemes[J].The Journal of China Universities of Posts and Telecommunications,2007,14(2):69-74. |
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| Authors: | YU Yong YANG Bo SUN Ying |
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| Affiliation: | 1. State Key Laboratory of ISN, Xidian University, Xi''an 710071, China;2. College of information, South China Agricultural University, Guangzhou 510642, China |
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| Abstract: | Proxy signature schemes allow an original signer to delegate his signing rights to a proxy signer. However, many proxy signature schemes have the defect which is the inability to solve the proxy revocation problem. In this article, we firstly propose an identity-based threshold signature scheme and show that it has the properties of unforgeability and robustness. In our threshold signature scheme, we adopt such a method that the private key associated with an identity rather than the master key is shared. Then, based on the threshold signature scheme, an identity-based mediated proxy signature scheme is proposed where a security mediator (SEM) is introduced to help a proxy signer to generate valid proxy signatures, examine whether a proxy signer signs according to the warrant, and check the revocation of a proxy signer. It is shown that the proposed scheme satisfies all the security requirements of a secure proxy signature. Moreover, a proxy signer must cooperate with the SEM to generate a valid proxy signature, which makes the new scheme have an effective and fast proxy revocation . |
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| Keywords: | identity-based threshold signature mediated proxy signature bilinear pairings |
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