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From Selective to Full Security: Semi-Generic Transformations in the Standard Model

Abstract : In this paper, we propose an efficient, standard model, semigeneric transformation of selective-secure (Hierarchical) Identity-Based Encryption schemes into fully secure ones. The main step is a procedure that uses admissible hash functions (whose existence is implied by collision-resistant hash functions) to convert any selective-secure wildcarded identity-based encryption (WIBE) scheme into a fully secure (H)IBE scheme. Since building a selective-secureWIBE, especially with a selective-secure HIBE already in hand, is usually much less involved than directly building a fully secure HIBE, this transform already significantly simplifies the latter task. This black-box transformation easily extends to schemes secure in the Continual Memory Leakage (CML) model of Brakerski et al. (FOCS 2010), which allows us obtain a new fully secure IBE in that model. We furthermore show that if a selective-secure HIBE scheme satisfies a particular security notion, then it can be generically transformed into a selective-secure WIBE. We demonstrate that several current schemes already fit this new definition, while some others that do not obviously satisfy it can still be easily modified into a selective-secure WIBE.
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Contributor : Michel Abdalla Connect in order to contact the contributor
Submitted on : Monday, December 9, 2013 - 1:21:09 PM
Last modification on : Thursday, March 17, 2022 - 10:08:35 AM

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Michel Abdalla, Dario Fiore, Vadim Lyubashevsky. From Selective to Full Security: Semi-Generic Transformations in the Standard Model. PKC 2012, May 2012, Darmstadt, Germany. pp.316-333, ⟨10.1007/978-3-642-30057-8_19⟩. ⟨hal-00915817⟩



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