摘要： 在随机预言模型中，现有的基于身份签密的多私钥生成器(PKG)方案都是可证明安全的。基于此，提出在标准模型中基于身份的多PKG签密方案，并证明其安全性。在DBDH假设下，方案的机密性满足在适应性选择密文攻击时，密文不可区分。在CDH假设下，方案的不可伪造性满足在适应性选择消息攻击时，签名存在性不可伪造。和已有方案相比，该方案在签密阶段效率较高。

关键词: 基于身份的签密方案, 多私钥生成器环境, 双线性对, 标准模型

Abstract: Several identity-based signcryption schemes for multiple Private Key Generator(PKG) are proved security in random oracle model, a new identity-based signcryption scheme for multiple PKG is proposed with security proof in standard model. The confidentiality against adaptive chosen ciphertext attack is obtained under DBDH assumption, and the unforgeability against adaptive chosen message attack is derived under the CDH assumption. Compared with the existing schemes, the new scheme’s signcryption phase is more efficient.

Key words: identity-based signcryption scheme, multiple Private Key Generator(PKG) environment, bilinear pairing, standard model

中图分类号: 

• TP309