标准模型下可证安全的基于身份门限签密方案

Provable Secure Identity-Based Threshold Signcryption Scheme in the Standard Model

提出了一种有效的基于身份的门限签密方案.采用双线性对映射技术,基于Waters和Paterson提出的签名方案,设计了标准模型下可证安全的门限签密方案,并利用决策双线性Diffie-Hellman问题的困难性证明了方案的语义安全性,同时利用计算Diffie-Hellman问题的困难性证明了方案的不可伪造性.相对随机预言模型下的同类方案,本文方案更具有实际意义.

An efficient identity-based threshold signcryption scheme was presented.With bilinear pairings technology,a proved secure threshold signcryption scheme was designed in the standard model,based on Waters and Paterson＇s signature scheme.We prove its semantic security on the hardness of decisional bilinear Diffie-Hellman problem and its unforgeability on the hardness of computational Diffie-Hellman problem.Compared with other schemes in the random oracle model,this scheme is more meaningful.