Progress in Cryptology - AFRICACRYPT 2010: Third by Daniel J. Bernstein, Tanja Lange

By Daniel J. Bernstein, Tanja Lange

Africacrypt 2010, the 3rd overseas convention on Cryptology in Africa, happened might 3-6, 2010 in Stellenbosch, South Africa. the overall Chairs, Riaal Domingues from the South African Communications and safety organization and Christine Swart from the collage of Cape city, have been regularly a excitement to paintings with and did an exceptional activity with the neighborhood preparations. we're deeplythankfulthat theyagreedto hostAfricacrypt2010with onlyfour months discover after unanticipated occasions pressured a metamorphosis of position. The Africacrypt 2010 submission cut-off date used to be cut up into . Authors s- mitting paperswererequiredto registertitles andabstractsby the rstdeadline, January five. a complete of 121 submissions were obtained through this cut-off date, - notwithstanding a few have been withdrawn sooner than assessment. Authors have been allowed to proceed engaged on their papers until eventually the second one closing date, January 10. Submissions have been evaluated in 3 levels over a interval of approximately months. the choice part all started on January five: application Committee m- bers begun comparing abstracts and volunteering to address numerous papers. We assigned a group of individuals to every paper. The evaluation section began on January eleven: software Committee participants got entry to the complete papers and - gan in-depth reports of eighty two submissions. lots of the reports have been accomplished via February7, thebeginningofthediscussionphase.ProgramCommitteemembers got entry to different reports and outfitted consensus of their reviews of the submissions. finally the discussions integrated 285 complete stories and 203 - ditional reviews. The submissions, reports, and next discussions have been dealt with easily by means of iChair.

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Extra info for Progress in Cryptology - AFRICACRYPT 2010: Third International Conference on Cryptology in Africa, Stellenbosch, South Africa, May 3-6, 2010, Proceedings (Lecture Notes in Computer Science)

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They require that each user of the blind signature scheme has to register before being able to obtain signatures. We also discuss the relation to our model. Contribution. We propose a novel security model, which is a generalization of the well-studied models of Juels, Luby, and Ostrovsky [18] and Pointcheval and Stern [23] for blind signatures, the model of Abe and Ohkubo [3] for fair blind signatures, and that of Abe and Fujisaki [1] for partially blind signatures. With our model for fair partially blind signatures, we provide a unified framework that can be used to instantiate blind, fair blind, and partially blind signature schemes under a strong security model.

For both weaknesses, two different countermeasures have been proposed, namely, fair blind and partially blind signatures. de). Dominique Schr¨ oder was supported by the Emmy Noether Program Fi 940/2-1 of the German Research Foundation (DFG). J. Bernstein and T. ): AFRICACRYPT 2010, LNCS 6055, pp. 34–51, 2010. c Springer-Verlag Berlin Heidelberg 2010 Fair Partially Blind Signatures 35 Fair blind signatures, suggested by Stadler, Piveteau, and Camenisch [24], involve a trusted third party, which is able to revoke blindness in case of a dispute between signer and user.

Chen, K. ) ASIACRYPT 2006. LNCS, vol. 4284, pp. 444–459. : Fully anonymous group signatures without random oracles. In: Kurosawa, K. ) ASIACRYPT 2007. LNCS, vol. 4833, pp. 164–180. : Homomorphic trapdoor commitments to group elements. : Efficient non-interactive proof systems for bilinear groups. P. ) EUROCRYPT 2008. LNCS, vol. 4965, pp. 415–432. : On the anonymity of fair offline e-cash systems. N. ) FC 2003. LNCS, vol. 2742, pp. 34–50. : Fair blind signatures revisited. , Okamoto, T. ) Pairing 2007.

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