Title :
An efficient and provably secure ID-based threshold signcryption scheme
Author :
Li, Fagen ; Yu, Yang
Author_Institution :
Sch. of Comput. Sci. & Eng., Univ. of Electron. Sci. & Technol. of China, Chengdu
Abstract :
Signcryption is a cryptographic primitive that performs digital signature and public key encryption simultaneously, at a lower computational costs and communication overheads than the signature-then-encryption approach. Recently, two identity-based threshold signcryption schemes [12], [27] have been proposed by combining the concepts of identity-based threshold signature and signcryption together. However, the formal models and security proofs for both schemes are not considered. In this paper, we formalize the concept of identity-based threshold signcryption and give a new scheme based on the bilinear pairings. We prove its confidentiality under the Decisional Bilinear Diffie-Hellman assumption and its unforgeability under the Computational Diffie-Hellman assumption in the random oracle model. Our scheme turns out to be more efficient than the two previously proposed schemes.
Keywords :
digital signatures; public key cryptography; bilinear pairings; cryptographic primitive; decisional bilinear Diffie-Hellman assumption; digital signature; public key encryption; random oracle model; secure ID-based threshold signcryption scheme; Computational efficiency; Computer networks; Computer science; Digital signatures; Elliptic curve cryptography; Identity-based encryption; Laboratories; Public key; Public key cryptography; Security;
Conference_Titel :
Communications, Circuits and Systems, 2008. ICCCAS 2008. International Conference on
Conference_Location :
Fujian
Print_ISBN :
978-1-4244-2063-6
Electronic_ISBN :
978-1-4244-2064-3
DOI :
10.1109/ICCCAS.2008.4657820