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Communication Dans Un Congrès Année : 2014

(Hierarchical) Identity-Based Encryption from Affine Message Authentication


We provide a generic transformation from any 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 the first tightly secure HIBE in the standard model.
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Dates et versions

hal-01239920 , version 1 (23-03-2016)



Olivier Blazy, Eike Kiltz, Jiaxin Pan. (Hierarchical) Identity-Based Encryption from Affine Message Authentication. Advances in Cryptology - Proceedings of CRYPTO '14, 2014, Santa Barbara, California, United States. pp.408-426, ⟨10.1007/978-3-662-44371-2_23⟩. ⟨hal-01239920⟩


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