前向安全的指定验证者代理签名方案

Forward Secure Designated Verifier Proxy Signature Scheme

针对指定验证者代理签名中的密钥泄漏问题,提出一种前向安全的指定验证者代理签名方案。引入前向安全的思想,将整个签名的有效时间分为T个时间段,公钥始终保持不变,私钥则随时间的推进不断更新。实验结果表明,该方案能提高效率,并且能保证即使在代理签名者当前时段的签名私钥被泄露,敌手也不能成功伪造此时段之前的代理签名,从而减小密钥泄漏带来的损失。

To deal with the key exposure problem in the designated verifier proxy signature, a forward secure designated verifier proxy signature scheme is proposed. The forward-secure thought is integrated into the new scheme in which the whole validity time is divided into T time periods, the public key always stays fixed while the private key updates as time goes. Experimental results show that the new scheme not only has some degree of improvement in terms of efficiency, but also realizes that even if the current proxy signer＇s key is exposed, the adversary can not succeed in forging the valid proxy signature pertaining to the past which can effectively reduce the damage of key exposure.