一种可抗DLC攻击的强代理签名方案

Strong Proxy Signature Against DLC Attack

针对B.Lee等人强代理签名方案易受DLC攻击,提出了一种新的强代理签名方案,通过代理签名人私钥的逆来防止原始签名人DLC攻击,将原始签名人对代理私钥的DLC攻击由线性运算转化为离散对数运算,使攻击难度由O(n)提高到指数阶,增加了代理私钥的计算复杂度,使原始签名人无法从代理私钥中分离和删除出自己的私钥,从而无法伪造签名。经分析,新方案不仅能够抵抗原始签名人的DLC攻击,而且提高了安全性能和计算效率。

A new strong proxy signature scheme is proposed aiming at the DLC attack in B. Lee＇s scheme, the original signer＇s DLC attack with inversion operation of the proxy signer＇s private key is prevented, changed linear operation to DLP against the original signer＇s DLC attack, increased the complexity of proxy private key, and made it impossible to delete his/her private key with DLC attack. So the original signer cann＇t forge a signature or impose it on the proxy signer. The revised scheme improves the security and efficiency.