摘要： 基于二次剩余问题求解的困难性，提出一个具有前向安全性的代理重签名方案，通过半可信代理方，将代理者对消息的签名转化为委托者对同一消息的签名。理论分析结果证明，该方案能抵抗伪造攻击，即使当前周期的签名密钥被泄露，也不会影响此周期前签名的有效性。

关键词: 二次剩余问题, 代理重签名, 前向安全性, 强RSA假定, 数字签名

Abstract: Based on the difficulty in solving quadratic residues problem, this paper proposes a forward secure proxy re-signature scheme. Through a semi-trusted proxy, proxy’s signature on a message is transformed into consignor’s signature on it. Theroy analysis proves that the scheme can resist forgery attack, and it can maintain the security of former signature even if signature key of current cycle leaks.

Key words: quadratic residues problem, proxy re-signature, forward security, strong RSA assumption, digital signature

中图分类号: 

• TP391