基于身份无可信中心的指定验证人代理多重签名方案

摘要

使用双线性对,提出一个基于身份无可信中心的指定验证人代理多重签名方案.该方案假设私钥生成中心PKG(Private Key Generator)是不可信的,PKG和用户共同生成用户的私钥.相比已有的基于身份的指定验证人代理签名方案,新方案避免了用户私钥的泄露,解决了在基于身份代理签名时需要无条件信任PKG的问题.分析表明,该方案是安全的,具有一定的实用性.%An ID-based designated-veriiier proxy multi-signature scheme without trusted PKG is proposed by using the bilinear pairings in this paper. The scheme supposes that Private Key Generator (PKG) is not a trusted dealer, and user' s private key is generated by the PKG and user together. Compared with the existing ID-based designated-verifier proxy signature, the new scheme can prevent user' s secret key from leaking and solve the problems that the existing ID-based proxy signature need to trust PKG unconditionally. Analysis shows that the scheme is secure and has the practicability to certain extent.