Abstract: This paper proposes a multiple grade and multi-proxy signature scheme to protect agents’ identity based on RSA signature scheme. The producing center of shadow identity gives every agent a shadow identity to sign for messages, which ensures that agents’ identity can not be divulged, and the authority can ask producing center of shadow identity to trace back to the true identity of an agent when he abuses his power. Security analysis shows that the scheme has the properties of non-repudiation and distinguish ability, and it can not be faked up.

Key words: proxy signature, multiple grade proxy signature, multi-proxy multi-signature, agent identity protection

摘要： 基于RSA签名体制，提出一个可以保护代理人身份的多级多重代理签名方案，利用影子身份产生中心为每个代理人产生一个影子身份，以影子身份为消息签名，确保代理人的身份不被泄露。当代理人滥用职权时，权威机构可以要求影子身份产生中心根据其影子身份追溯代理人的真实身份。安全性分析表明，该方案具有不可否认性、可区分性和不可伪造性。

关键词: 代理签名, 多级代理签名, 多重代理多重签名, 代理人身份保护

CLC Number: 

• TP309.2