无可信中心下基于身份的门限签名方案

Identity-Based Threshold Signature Scheme with Non-Trusted Dealer

考虑到很多门限签名方案都不抵抗恶意PKG攻击的事实,本文提出了一个无可信中心下基于身份的门限签名方案,避免了该类型攻击.在该方案中,每一个签名参与者都可以验证公钥和公钥份额的合法性,从而避免了公钥份额替换攻击.给出了无可信中心下基于身份的门限签名方案不可伪造性的安全模型,并利用此安全模型给出了该方案在标准模型下的安全性证明.

Considering that lots of threshold signature schemes are insecure under malicious PKG attack, we pro- pose an identity-based threshold signature scheme with non-trusted dealer to avoid this attack. In our scheme, each signing player can verify the validity of the public key and the public key share to avoid the attack from replacing the public key share. This paper first gives the existential unforgeable security model of identity-based signature scheme with non-trusted dealer. We also prove the security from our proposed scheme in the standard model.