一种基于身份的广义签密方案

Identity-based Generalized Signcryption Scheme

利用双线性对提出一种基于身份的广义签密方案,通过输入身份的改变可实现签密、签名和加密3种模式。在拥有基于身份密码体制优点的同时,克服传统签密体制中接收方先解密后验证的缺点,保证任何第三方在不知道明文的前提下都可以认证密文。分析结果表明,该方案具有较好的安全性。

Generalized signcryption not only fulfills both the functions of signature and encryption, but also provides confidentiality or authenticity separately under specific inputs. This paper presents an identity-based generalized signcryption scheme based on bilinear pairing, in which three modes are re＇,dized through changing input＇s identities, i.e. signcryption mode, signature-only mode and encryption-only mode. The proposed scheme has improved the drawbacks of receiver verifying signature after decrypting in the traditional signcryption shceme. Anyone can identify the source of the ciphertext without the plaintext. The scheme is safe and also efficient regarding the computation costs after analyzing other schemes.