一种新的具有已知签名者的门限代理签名方案

利用双线性对理论和可验证的秘密分享技术，提出了一种新的具有已知签名者的门限代理签名方案．该方案通过在门限代理签名中引入实际参与签名的t个代理签名人的身份标志集合，解决了原有方案中门限代理签名方案中不具备强可识别性的问题；并利用双线性对的优点，克服了同类方案中存在的不能抵抗联合攻击和原始签名人伪造攻击等安全漏洞．结果表明：与同类方案相比，新方案的运算效率约提高20％，签名长度约缩短25％．

A New Threshold Proxy Signature Scheme with Known Signers

A new threshold proxy signature scheme with known signers based on bilinear pairings theory is proposed using the technique of verifiable secret sharing.This new scheme not only solves the problem that QCX scheme has not the property of strong identifiablity through introducing the set ASI in the threshold proxy signature but also overcomes the security leaks such as collusion attack,the original forgeable attack in the congener schemes.The conclusion shows that this new scheme heightens computation efficiency about twenty percent and shortens the length of signature twenty-five percent compared with congener schemes.