关键词: 异构密码系统, 混合签密, 基于身份的密码学, 无证书密码学, 随机预言模型

Abstract: Heterogeneous system signcryption schemes mostly use the public key encryption technology, which can not encrypt any long messages, and it is unsuitable for actual application situation. Therefore, this paper proposes a hybrid signcryption scheme based on heterogeneous cryptosystem. The heterogeneous signcryption scheme is from the identity-based cryptography system to the certificateless cryptography system. Simultaneously, the scheme not only satisfies that the private key generator and the key generation center can generate their own private master key respectively, but also satisfies confidentiality and unforgeability on the basis of the assumption of bilinear Diffie-Hellman difficult problems and Diffie-Hellman difficult problem, in the random oracle model.

Key words: heterogeneous systems, hybrid signcryption, Identity-Based Cryptography（IBC）, Certificateless Cryptography（CLC）, random orade model