Universally composable identity-based encryption

Authors:
Ryo Nishimaki;Yoshifumi Manabe;Tatsuaki Okamoto
Affiliations:
Graduate School of Infomatics, Kyoto University, Kyoto, Japan;Graduate School of Infomatics, Kyoto University, Kyoto, Japan;Graduate School of Infomatics, Kyoto University, Kyoto, Japan
Venue:
VIETCRYPT'06 Proceedings of the First international conference on Cryptology in Vietnam
Year:
2006

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Abstract

Identity-based encryption (IBE) is one of the most important primitives in cryptography, and various security notions of IBE (e.g., IND-ID-CCA2, NM-ID-CCA2, IND-sID-CPA etc.) have been introduced. The relations among them have been clarified recently. This paper, for the first time, investigates the security of IBE in the universally composable (UC) framework. This paper first defines the UC-security of IBE, i.e., we define the ideal functionality of IBE, $\mathcal{F}_\mathrm{IBE}$. We then show that UC-secure IBE is equivalent to conventionally-secure (IND-ID-CCA2-secure) IBE.