基于身份的无可信中心的环签密方案

ID-based ring signcryption scheme without trusted party

环签密不仅实现了消息的保密性和认证性,而且实现了签密者的完全匿名性。给出了基于身份的无可信中心的环签密的方案模型和安全定义,提出和证明了一种有效的基于身份的无可信中心的环签密方案,与已有的方案比较,不需要可信的PKG,解决了基于身份密码体制中的密钥托管问题,提高了效率。该方案满足匿名性、保密性、不可伪造性、身份验证、可追踪性。

Ring signcryption realizes the confidentiality and authenticity of message at the same time,and realizes full anonymity of the signcrypter.The model and the notion of security of ID-based ring signcryption scheme without trusted party are given,and an ID-based ring signcryption scheme without trusted party is proposed.Compared with the original programs,trusted PKG is not needed and the problem of key escrow in the ID-based public key cryptography is eliminated in this scheme.Efficiency of the scheme is improved.Proposed scheme has the following properties：Signcrypter anonymity,indistinguishability,unforgeability,identity verifiablity and trace.