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

Michel Abdalla, Dario Fiore, and Vadim Lyubashevsky

##### Abstract

In this paper, we propose an efficient, standard model, semi-generic 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 \emph{wildcarded} identity-based encryption (WIBE) scheme into a fully secure (H)IBE scheme. Since building a selective-secure WIBE, 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.

Available format(s)
Category
Public-key cryptography
Publication info
Published elsewhere. This is the full version of the paper that appeared at PKC 2012
Keywords
identity based encryptionselective security
Contact author(s)
fiore @ cs nyu edu
History
Short URL
https://ia.cr/2012/341

CC BY

BibTeX

@misc{cryptoeprint:2012/341,
author = {Michel Abdalla and Dario Fiore and Vadim Lyubashevsky},
title = {From Selective to Full Security: Semi-Generic Transformations in the Standard Model},
howpublished = {Cryptology ePrint Archive, Paper 2012/341},
year = {2012},
note = {\url{https://eprint.iacr.org/2012/341}},
url = {https://eprint.iacr.org/2012/341}
}

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