Cryptology ePrint Archive: Report 2013/803

Fully, (Almost) Tightly Secure IBE from Standard Assumptions

Jie Chen and Hoeteck Wee

Abstract: We present the first fully secure Identity-Based Encryption scheme (IBE) from the standard assumptions where the security loss depends only on the security parameter and is independent of the number of secret key queries. This partially answers an open problem posed by Waters (Eurocrypt 2005). Our construction combines Waters' dual system encryption methodology (Crypto 2009) with the Naor-Reingold pseudo-random function (J. ACM, 2004) in a novel way. The security of our scheme relies on the DLIN assumption in prime-order groups.

Category / Keywords: public-key cryptography / Identity-based encryption, tight security proofs

Original Publication (with major differences): IACR-CRYPTO-2013

Date: received 30 Nov 2013

Contact author: s080001 at e ntu edu sg;hoeteck at alum mit edu

Available format(s): PDF | BibTeX Citation

Version: 20131201:163922 (All versions of this report)

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