Efficient Identity-Based Signcryption in the Standard Model

摘要: Signcryption is a cryptographic primitive that fulfills both the functions of digital signature and public key encryption simultaneously, at cost significantly lower than required by traditional signature-then-encryption approach. has been shown to be useful in many applications, such as electronic commerce, mobile communications smart cards. Recently, three identity-based signcryption schemes standard model were proposed. However, are broken soon. How construct secure scheme still an open problem. In this paper, we solve problem propose efficient model. We prove our indistinguishability against adaptive chosen ciphertext attacks under modified decisional bilinear Diffie-Hellman assumption existential unforgeability messages computational assumption.