Identity-based cryptosystems and signature schemes
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SAC '02 Revised Papers from the 9th Annual International Workshop on Selected Areas in Cryptography
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STOC '08 Proceedings of the fortieth annual ACM symposium on Theory of computing
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INDOCRYPT '09 Proceedings of the 10th International Conference on Cryptology in India: Progress in Cryptology
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ASIACRYPT'05 Proceedings of the 11th international conference on Theory and Application of Cryptology and Information Security
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ICCSA'05 Proceedings of the 2005 international conference on Computational Science and Its Applications - Volume Part II
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EUROCRYPT'05 Proceedings of the 24th annual international conference on Theory and Applications of Cryptographic Techniques
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EUROCRYPT'06 Proceedings of the 24th annual international conference on The Theory and Applications of Cryptographic Techniques
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ACISP'06 Proceedings of the 11th Australasian conference on Information Security and Privacy
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WISA'11 Proceedings of the 12th international conference on Information Security Applications
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In this paper, we show how to construct an Identity Based Signcryption Scheme (IBSC) using an Identity Based Encryption (IBE) and an Identity Based Signature (IBS) schemes. We show that the security of the IBSC scheme-indistinguishability as well as unforgeablity-is derived from the security of the underlying IBE and IBS schemes. Moreover, we show that under mild (reasonable) assumptions, the scheme is both space and time efficient compared to the Sign-then-Encrypt approach.