Security

Identity Based Online/Offline Signcryption Scheme

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Executive Summary

Online/Offline signcryption is a cryptographic primitive where the signcryption process is divided into two phases - online and offline phase. Most of the computations are carried out offline (where the message and the receiver identity are unavailable). The online phase does not require any heavy computations like pairing, multiplication on elliptic curves and is very efficient. To the best of the knowledge there exist three online/offline signcryption schemes in the literature: The authors propose various attacks on all the existing schemes. Then, they give the first efficient and provably secure identity based online/offline signcryption scheme.

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