中文摘要：

基于模合数平方根和因子分解问题的难解性,首次提出一个具有前向安全性的环签名方案,即使攻击者非法获取了用户当前签名密钥,也无法伪造之前的签名。

英文摘要：

This paper first proposed forward secure ring signature scheme based on the difficulty of quadratic root modulo composite and factorization problem. Even the attacker obtained the current secret key of some user illegally, he still could not forge the signature of the past time period.