当前,基于身份的数字签名体制研究取得丰硕的成果,利用双线性映射的GDH(Gap D iffie-Hellman)问题,人们提出了许多可证安全的基于身份密码体制。提供了一种直接利用现有的基于身份的数字签名体制,构造基于身份代理签名体制的途径,并利...当前,基于身份的数字签名体制研究取得丰硕的成果,利用双线性映射的GDH(Gap D iffie-Hellman)问题,人们提出了许多可证安全的基于身份密码体制。提供了一种直接利用现有的基于身份的数字签名体制,构造基于身份代理签名体制的途径,并利用可证安全理论,在标准计算模型下给出了严格的安全性证明。展开更多
Proxy signature schemes enable an entity to del- egate its signing rights to any other party, called proxy signer. As a variant of proxy signature primitive, proxy multi- signature allows a group of original signers t...Proxy signature schemes enable an entity to del- egate its signing rights to any other party, called proxy signer. As a variant of proxy signature primitive, proxy multi- signature allows a group of original signers to delegate their signing capabilities to a single proxy signer in such a way that the proxy signer can sign a message on behalf of the group of original signers. We propose a concrete ID-based proxy multi-signature scheme from bilinear pairings. The proposed scheme is existential unforgeable against adaptively chosen message and given ID-attack in random oracle model under the computational Diltie-Hellman （CDH） assumption. The fascinating property of new scheme is that the size of a proxy multi-signature is independent of the number of original sign- ers. Furthermore the proposed scheme is simple and com- putationally more efficient than other ID-based proxy multi- signature schemes.展开更多
基金甘肃省自然科学基金(the Natural Science Foundation of Gansu Province of China under Grant No.3ZS051-A25-042)甘肃省科技公关计划(the Key Technologies R&D Program of Gansu Province, China under Grant No.2GS064-A52-035-03)
基金Supported by the National Natural Science Foundation of China under Grant Nos.60373039, 90604010(国家自然科学基金)the National Science Fund for Distinguished Young Scholars of China under Grant No.60025205(国家杰出青年科学基金)
文摘当前,基于身份的数字签名体制研究取得丰硕的成果,利用双线性映射的GDH(Gap D iffie-Hellman)问题,人们提出了许多可证安全的基于身份密码体制。提供了一种直接利用现有的基于身份的数字签名体制,构造基于身份代理签名体制的途径,并利用可证安全理论,在标准计算模型下给出了严格的安全性证明。
文摘Proxy signature schemes enable an entity to del- egate its signing rights to any other party, called proxy signer. As a variant of proxy signature primitive, proxy multi- signature allows a group of original signers to delegate their signing capabilities to a single proxy signer in such a way that the proxy signer can sign a message on behalf of the group of original signers. We propose a concrete ID-based proxy multi-signature scheme from bilinear pairings. The proposed scheme is existential unforgeable against adaptively chosen message and given ID-attack in random oracle model under the computational Diltie-Hellman （CDH） assumption. The fascinating property of new scheme is that the size of a proxy multi-signature is independent of the number of original sign- ers. Furthermore the proposed scheme is simple and com- putationally more efficient than other ID-based proxy multi- signature schemes.
