Cryptology ePrint Archive: Report 2014/380

Efficient Adaptively Secure IBBE from Standard Assumptions

Somindu C. Ramanna and Palash Sarkar

Abstract: This paper describes the first construction of efficient identity-based broadcast encryption (IBBE) schemes which can be proved secure against adaptive-identity attacks based on standard assumptions. The constructions are obtained by extending the currently known most efficient identity-based encryption scheme proposed by Jutla and Roy in 2013. Ciphertext size and user storage compare favourably to previously known constructions. The new constructions fill both a practical and a theoretical gap in the literature on efficient IBBE schemes.

Category / Keywords: public-key cryptography / identity-based encryption, broadcast encryption, identity-based broadcast encryption, Type-3 pairings, dual-system technique

Date: received 28 May 2014

Contact author: palash at isical ac in

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Version: 20140528:164009 (All versions of this report)

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