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给出了攻击ElGamal类型数字签名方案的一种方法,揭示了签名所需时间与随机参数k取值之间的关系,指出当k值较小时,此类签名方案是不安全的。
A method of attacking ElGamal type digital signature scheme is given. The relationship between the time required for signature and the value of random parameter k is revealed. It is pointed out that this signature scheme is not secure when the value of k is small.