By David Pointcheval, Damien Vergnaud
This e-book constitutes the refereed complaints of the seventh overseas convention at the concept and alertness of Cryptographic suggestions in Africa, AFRICA CRYPT 2014, held in Marrakesh, Morocco in may well 2014. The 26 papers provided including 1 invited speak have been conscientiously 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 different types of cryptography and its functions as follows: Public-Key Cryptography, Hash capabilities, Secret-Key Cryptanalysis, quantity idea, Implementation, Protocols and Lattice-based Cryptography.
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Additional info for Progress in Cryptology – AFRICACRYPT 2014: 7th International Conference on Cryptology in Africa, Marrakesh, Morocco, May 28-30, 2014. Proceedings
PKC 2009. LNCS, vol. 5443, pp. 357–376. Springer, Heidelberg (2009) 26. : Type-based proxy re-encryption and its construction. , Das, A. ) INDOCRYPT 2008. LNCS, vol. 5365, pp. 130–144. Springer, Heidelberg (2008) 27. : Conditional proxy re-encryption — a more eﬃcient construction. , Nagamalai, D. ) CNSA 2011. CCIS, vol. 196, pp. 502–512. Springer, Heidelberg (2011) 28. : Eﬃcient identity-based encryption without random oracles. In: Cramer, R. ) EUROCRYPT 2005. LNCS, vol. 3494, pp. 114–127. Springer, Heidelberg (2005) 29.
2. Pick randomly r ← (B) 3. If G(ω, ω , ID ) = 0 (mod q), set bad ← true and return RA→B = ⊥. 4. H(Z ,z ,ID(B) ) ,z ,ID(B) ) G(ω,ω ,ID(B) ) −yB . H(Z ·(ha ) · hryB . (B) r˜ It implicitly deﬁnes R1 = h · V · i=1 FVi idi and R2 = hr˜ B with r˜ = ryB − G(ω,ωay,ID (B) ) . • If A is the target user and B is honest, then B proceeds as follows. B returns a random re-encryption key: RA→B = (ID(B) , R1 , R2 ), where R1 and R2 are randomly picked from G2 . The adversary will not detect that this re-encryption key is inconsistent since it does not have B’s secret key and the considered attack is chosen plaintext and not chosen ciphertext.
In ) for the action of running A on inputs i1 , i2 , . . , in with random coins, and assigning the result to a. If a is a variable, |a| denotes the length in bits of its representation. We denote by a||b the concatenation of variables a and b, represented as bit-strings. Games. In this paper we use the code-based game-playing language . Each game has an Initialize and a Finalize procedure. It also has speciﬁcations of procedures to respond to an adversary’s various queries. A game is run with an adversary A as follows.