基于Lee 等人提出的修改的LKK 型方案，提出了一种改进的强代理签名方案。新方案在授权阶段采用CA 认证的密钥生成协议，解决了原方案中不能抵抗原始签名人伪造攻击和原始签名人变换攻击的问题。分析表明，所提方案能够满足强代理签名方案的安全性需求。关键字：强代理签名；伪造攻击；密钥生成协议Abstract: Based on the revised LKK scheme presented by Lee et al.,a improved strong proxysignature scheme is proposed.A new method adoptes protocol of secret key generation whichpassed the CA authentication in authorizated phase.The problem that the original scheme isinsecure against the original signer’s forgery attack and original signer’s changing attack is resolved.Analysis shows that the proposed scheme satisfics all security properties of the strong proxy signature scheme.Key words:strong proxy signature; forgery attack; protocol of secret key generation