摘要: 在一般的数字签名中,拥有签名者公钥的任何人都可以验证该签名的有效性;而强指定验证者签名是由签名者指定一个验证者,在签名验证阶段,只有这个指定验证者可以验证该签名的有效性,其他人都不能验证该签名。这是因为在签名的验证阶段必须用到指定验证者的私钥。基于这个性质,强指定验证者签名被广泛应用于电子商务、网上投标、电子选举中。基于双线性对提出了一个新的基于身份的强指定验证者签名方案,并基于GBDH困难问题假设,采用密码学上安全性分析的方法,证明了该方案在适应性选择消息和选择身份攻击下是不可伪造的。最后,分析了方案的计算成本,结果表明该方案具有较高的效率。
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