一种基于Ohta-Okamoto签名的门限群签名方案

A Threshold Signature Scheme Based on Ohta-Okamoto Signature

在修改的Ohta_Okamoto数字签名方案基础上,设计出了一个新的(t,n)门限签名方案。该方案具有可验证性和防止内部成员合谋攻击;而且验证者在验证群签名的有效性计算的复杂性与一般个人签名方案一样。该方案的安全性是基于大整数的因式分解,因此在计算上是安全的。

An new （t, n） threshold signature scheme is proposed based on the modified the Ohta-Okamoto＇ s signature. The scheme has the property of verification and can prevent inside member conspiracy attack. The verifier can verify the group signature easily and the verification time of group signature is equivalent to that of an individual signature. The security of this scheme base on factofizafion of big integer, therefore, the scheme is secure for calculation.