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分析了一个在格理论框架下构建的基于身份的代理签名方案,指出方案的安全性证明存在缺陷,并没有实现其所声称的签名不可伪造性的证明,针对方案证明中存在的问题,引入新的参量,重新设定系统参数,改变相应的查询应答方式,弥补了证明缺陷,完成了签名不可伪造性的证明。
An identity-based proxy signature scheme constructed under the framework of lattice theory is analyzed. It is pointed out that the security proof of the scheme is flawed and the proof of the unforgeability of the signature is not realized. In view of the problems existing in the scheme proof, Of the parameters, re-set the system parameters, change the corresponding response to the query to make up for the proof of defects, completed the signature of the unforgeability proof.