This paper proposes a new signature scheme which is verified by an inequality and is the extended form of the equality verification . the new scheme is secure in theory and is suitable for some practice 本文提出了一个新的数字签名方案,它通过判定验证值是否满足一个不等式的方式来验证签名的合法性,实质是等式验证的进一步推广.新方案在理论分析上是安全的,并具有较大的实用价值