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Progress in Cryptology – AFRICACRYPT 2014: 7th International by David Pointcheval, Damien Vergnaud

By David Pointcheval, Damien Vergnaud

This ebook constitutes the refereed lawsuits of the seventh foreign convention at the conception and alertness of Cryptographic options in Africa, AFRICA CRYPT 2014, held in Marrakesh, Morocco in could 2014. The 26 papers awarded including 1 invited speak have been rigorously reviewed and chosen from eighty three submissions. the purpose of Africa crypt 2014 is to supply a global discussion board for practitioners and researchers from undefined, academia and executive from worldwide for a panoramic dialogue of all varieties of cryptography and its functions as follows: Public-Key Cryptography, Hash services, Secret-Key Cryptanalysis, quantity concept, Implementation, Protocols and Lattice-based Cryptography.

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Extra info for Progress in Cryptology – AFRICACRYPT 2014: 7th International Conference on Cryptology in Africa, Marrakesh, Morocco, May 28-30, 2014. Proceedings

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CRYPTO 2003. LNCS, vol. 2729, pp. 565–582. Springer, Heidelberg (2003) 15. : Efficient unidirectional proxy reencryption. , Lange, T. ) AFRICACRYPT 2010. LNCS, vol. 6055, pp. 316–332. Springer, Heidelberg (2010) 16. : Conditional proxy broadcast re-encryption. , Gonz´ alez Nieto, J. ) ACISP 2009. LNCS, vol. 5594, pp. 327–342. Springer, Heidelberg (2009) 17. : Interactive conditional proxy re-encryption with fine grain policy. Journal of Systems and Software 12, 2293–2302 (2011) 18. : Outsourcing the decryption of ABE ciphertexts.

34 A. Arriaga, Q. Tang, and P. Ryan which provides insufficient privacy guarantees in practice, considering that an actual attacker may have access to a much larger number of (possibly related) trapdoors. As we show in Section 4, and contrarily to intuition, the so-called hybrid argument does not apply here, unless trapdoors can be efficiently rerandomized. Also, after the transformation from IBE to PEKS, Function Privacy leads to a security definition that provides limited privacy guarantees against search patterns, since the resulting model prevents the adversary from being challenged with trapdoors encoding the same keyword.

Challenge. A outputs two messages M0 and M1 , and a target path S . If G(ω, ω , IDS ) = 0 then bad ← true and define the challenge as follows: Pick c $ δ← − {0, 1}, give C = (Mδ ·T, g c , , (Ui,j )c i∈I ,j∈[[1,n ]] , S ) i∈I∗ FUi (si ) i ∗ to A, and, otherwise define it as in the Game 0. – Guess. A returns δ and eventually B returns 1 if δ = δ and 0 otherwise, even if bad = true. Game 2. We modify the simulation of the re-encryption keys and the challenge, in the case where the flag bad is set to true during Game 0.

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