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近年来,为了解决基于传统公钥密码系统中证书的使用问题和基于身份密码体统中固有的密钥托管问题,无证书公钥密码系统的概念被引进。文中基于双线性对提出了一个新的无证书环签密方案,使得消息能够以一种匿名的方式被发送并同时具有保密性和认证性,接收方仅知道消息来自于某个群体,但不能确认是这个群体中的哪个成员。在随机预言模型下,基于决定性双线性Diffie-Hellman困难问题假设,文中方案是安全的。较之传统的“先签名后加密”的模式,文中方案更加有效。
In recent years, the concept of certificateless public-key cryptosystem has been introduced to solve the problem of using certificates in traditional public-key cryptosystem and key escrow problem in identity-based cryptosystem. In this paper, a new certificateless ring signature scheme based on bilinear pairing is proposed. The message can be sent in an anonymous manner with both confidentiality and authenticity. The receiver only knows that the message came from a certain group, Can not confirm which member of this group. Under the random oracle model, based on the assumption of deterministic bilinear Diffie-Hellman problem, the scheme in this paper is safe. Compared with the traditional “first sign after encryption” mode, the text scheme more effective.