Welcome to the resource topic for 2014/581
Title:
(Hierarchical) Identity-Based Encryption from Affine Message Authentication
Authors: Olivier Blazy, Eike Kiltz, Jiaxin Pan
Abstract:We provide a generic transformation from any \emph{affine} message authentication code (MAC) to an identity-based encryption (IBE) scheme over pairing groups of prime order. If the MAC satisfies a security notion related to unforgeability against chosen-message attacks and, for example, the k-Linear assumption holds, then the resulting IBE scheme is adaptively secure. Our security reduction is tightness preserving, i.e., if the MAC has a tight security reduction so has the IBE scheme. Furthermore, the transformation also extends to hierarchical identity-based encryption (HIBE). We also show how to construct affine MACs with a tight security reduction to standard assumptions. This, among other things, provides a tightly secure IBE in the standard model.
ePrint: https://eprint.iacr.org/2014/581
Talk: https://www.youtube.com/watch?v=veGnaJKpK30
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