A Short Verifier-Local Revocation Group Signature Scheme with Backward Unlinkability
A Short Verifier-Local Revocation Group Signature Scheme with Backward Unlinkability
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DOI：
10.1093/ietfec/e90-a.9.1793
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发表时间：
2006-10
期刊：
影响因子：
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通讯作者：
T. Nakanishi;N. Funabiki
中科院分区：
文献类型：
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作者：
T. Nakanishi;N. Funabiki
基于双线性映射的验证人-局部撤销（VLR）群签名方案是近年来提出的一种新的群签名方案。在VLR方案中，只有验证者参与成员的撤销，而签名者不参与成员的撤销。因此，该方案适用于移动的环境。此外，以前提出的计划满足一个重要的属性，向后不可链接。这意味着即使成员被撤销，成员在撤销之前产生的签名仍然是匿名的。如果会员自愿离开或钥匙被盗，则需要此属性。本文提出了一种改进的方案，其中群签名更短。这是通过使用不同的假设，DLDH假设，并改进群签名中的零知识证明实现的。所提出的群签名长度约为以前群签名长度的53%。
Previously Verifier-Local Revocation (VLR) group signature schemes from bilinear maps were proposed. In VLR schemes, only verifiers are involved in the revocation of a member, while signers are not involved in the revocation. Thus, the schemes are suitable for mobile environments. Furthermore, the previously proposed schemes satisfy an important property, the backward unlinkability. It means that even after a member is revoked, signatures produced by the member before the revocation remain anonymous. This property is needed in case a member leaves voluntarily or in case of a stolen key. In this paper an improved scheme is proposed, where the group signatures are shorter. This is achieved using a different assumption, DLDH assumption, and improving zero-knowledge proofs in the group signatures. The length of the proposed group signatures is about 53% of that of the previous ones.