关键词: 自认证盲签密, UC安全性, 理想函数, 适应性选择密文攻击

Abstract: Self-certified blind signcryption (SCBSC) protocol can simultaneously fulfill public key encryption and blind signature. When disputation occurs between the sender and recipient, any third party can verify the validity of the signature. However, the existing self-certified blind signcryption protocol does not yet have universally composable (UC) security. Aiming at this problem, the UC security framework is introduced. The use of this framework can analyze and design self-certified blind signcryption protocol in modularity. Firstly, the ideal function of self-certified blind signcryption protocol is defined under the UC security framework; secondly, under the adaptive adversary model, self-certified blind signcryption protocol may achieve functionality, if and only if self-certified blind signcryption protocol satisfies the indistinguishability against adaptive chosen-ciphertext attacks (IND-CCA2)

Key words: self-certified blind signcryption, UC security, ideal function, adaptive chosen-ciphertext attacks