| 摘要: |
| 研究在新提出的无证书公钥密码系统下的代理签名问题,给出了无证书代理签名方案非常强的安全模型.该安全模型下的攻击者是能力最强的超级类型I 和类型II 攻击者.同时,利用双线性映射设计了一个高效的无证书代理签名方案.其安全性基于计算Diffie-Hellman 问题的困难性,并在此安全模型下给出正式的安全证明. 鉴于方案的安全、高效和无证书管理的优点,它可广泛应用于电子商务、移动代理系统等方面. |
| 关键词: 无证书密码系统 双线性映射 计算Diffie-Hellman 问题 代理签名 随机预言器 |
| DOI： |
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| 基金项目:Supported by the National Natural Science Foundation of China under Grant No.60673070 (国家自然科学基金); the NaturalScience Foundation of Jiangsu Province of China under Grant No.BK2006217 (江苏省自然科学基金) |
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| Certificateless Proxy Signature Scheme with Provable Security |
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CHEN Hu,ZHANG Fu-Tai,SONG Ru-Shun
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| Abstract: |
| This paper studies proxy signatures in the newly proposed certificateless public key setting. The authorspresent a very strong security model for certificateless proxy signature schemes against both Super Type IAdversary and Super Type II Adversary. And also an efficient construction of certificateless proxy signature schemeusing bilinear maps is put forward. The security of this scheme is based on the infeasibility of the ComputationalDiffie-Hellman problem and is formally proven under the security model of certificateless proxy signature schemes.Due to its security, high efficiency and freedom from certificate management, it may have practical applications inelectronic commerce and mobile agent systems, etc. |
| Key words: certificateless cryptography bilinear map computational Diffie-Hellman problem proxy signature random Oracle |
