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聚合签名是近年被关注的一个热点。基于无证书密码体制,构造了一个改进的无证书聚合签名方案,较之于已有的方案,本方案的对运算是常量的,只需3次对运算,提高了签名验证时的效率。改进的方案可以抵抗无证书攻击模型中类型Ⅰ敌手与类型Ⅱ敌手的攻击,在计算性Diffie-Hellman困难问题假设下,该方案是存在性不可伪造的,并在随机预言机模型中给出了方案的安全性证明。
Polymerization signature is a hot spot in recent years. Based on the certificateless cryptosystem, an improved certificateless aggregate signature scheme is constructed. Compared with the existing schemes, the scheme is computationally constant and requires only three pairs of operations, which improves the efficiency of signature verification. The improved scheme can resist the attack of type I adversary and type II adversary in the certificateless attack model. Under the assumption of computational Diffie-Hellman problem, the scheme is existential and unforgeable, and is given in the random oracle model Program safety certification.