386 research outputs found
Transport as a new avenue for CV prevention in city dwellers: how to kill two birds with one stone?
No full textNeven, A (reprint author), Hasselt Univ, Transportat Res Inst IMOB, B-3590 Diepenbeek, Belgium.
[email protected]; [email protected]; [email protected]; [email protected]
Unrestricted aggregate signatures
No full textsponsorship: Mihir Bellare was supported by NSF grants CNS-0524765, CNS-0627779, and a gift from Intel Corporation. Chanathip Namprempre was supported by the Thailand Research Fund. Gregory Neven is a Postdoctoral Fellow of the Research 422 M. Bellare, C. Namprempre, and G. Neven Foundation Flanders, and was supported in part by the Concerted Research Action Ambiorics 2005/11 of the Flemish Government and the European Commission through the IST Programme under Contract IST-2002-507932 ECRYPT. (NSF|CNS-0524765, NSF|CNS-0627779, Intel Corporation, Thailand Research Fund, Flemish Government, European Commission through the IST Programme|IST-2002-507932 ECRYPT)status: Publishe
Identity-Based Multi-Signatures from RSA
No full textsponsorship: Mihir Bellare was supported by NSF grant CNS-0524765, a gift from Intel Corporation, and NSF CyberTrust project CT-ISG: Cryptography for Computational Grids. Gregory Neven is a Postdoctoral Fellow of the Flemish Research Foundation (FWO Vlaanderen), and was supported in part by the Concerted Research Action (GOA) Ambiorics 2005/11 of the Flemish Government and in part by the European Commission through the IST Programme under Contract IST-2002-507932 ECRYPT. (NSF|CNS-0524765, NSF CyberTrust project "CT-ISG: Cryptography for Computational Grids", Concerted Research Action (GOA) Ambiorics of the Flemish Government|2005/11, European Commission through the IST Programme|IST-2002-507932)status: Publishe
Simulatable adaptive oblivious transfer
No full textsponsorship: The authors would like to thank Xavier Boyen, Christian Cachin, Anna Lysyanskaya,Benny Pinkas, Alon Rosen and the anonymous referees for their useful comments and discussions. Gregory Neven is a Postdoctoral Fellow of the Research Foundation Flanders (FWO-Vlaanderen). This work was supported in part by the European Commission through the IST Program under Contract IST-2002-507932 ECRYPT and Contract IST-2002-507591 PRIME. (European Commission through the IST|IST-2002-507932, European Commission through the IST|IST-2002-507591)status: Publishe
Architect Neven Šegvić – Theoretical Works
No full textAutor članka bavi se istraživanjem opusa arhitekta Nevena Šegvića. U trijadi njegova djela – teorijski rad, projektantski rad, pedagoški rad – tekst obrađuje problematiku prvog segmenta. Analizom evidentiranih bibliografskih jedinica autor sagledava vrijednost pojedinačnoga djela unutar duktusa cjelokupnoga znanstveno-publicističkog djela. Verifikacijom i valorizacijom izlučnih radova te uspostavom stratifikacije elaborira se teza o postojanju pet problemsko-razvojnih faza teorijskog opusa arhitekta Nevena Šegvića.Within his work on the oeuvre of the architect Neven Šegvić, the author focuses in this paper on Šegvić’s theoretical work, as one of the three main subject areas of his career, the others being architectural design and teaching. The analysis of Šegvić’s bibliography provides a basis for a critical evaluation of each particular work and its positioning within the entire theoretical oeuvre. The analysis is followed by a stratification in which the author identifies five discrete development phases in Neven Šegvić’s theoretical work
Generalized IBE in the exponent-inversion framework
No full textThe purpose of this chapter is to provide an abstraction for the class of Exponent-Inversion IBE exemplified by the [Bscr ][Bscr ]2 and [Sscr ][Kscr ] schemes, and, on the basis of that abstraction, to show that those schemes do support interesting and useful extensions such as HIBE and ABE. \ud
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Our results narrow, if not entirely close, the “flexibility gap” between the Exponent-Inversion and Commutative-Blinding IBE concepts
Flexible IBE and beyond in the commutative-blinding framework
No full textThe cryptographic community has, of late, shown much inventiveness in the creation of powerful new IBE-like primitives that go beyond the basic IBE notion and extend it in many new directions. Virtually all of these “super-IBE” schemes rely on bilinear pairings for their implementation, which they tend to use in a surprisingly small number of different ways: three of them as of this writing. \ud
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What is interesting is that, among the three main frameworks that we know of so far, one has acted as a veritable magnet for the construction of many of these “generalized IBE” primitives, whereas the other two have not been nearly as fruitful in that respect. This refers to the Commutative Blinding framework defined by the Boneh-Boyen [Bscr ][Bscr ]1 IBE scheme from 2004. \ud
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The aim of this chapter is to try to shed some light on this approach's popularity, first by comparing its key properties with those of the competing frameworks, and then by providing a number of examples that illustrate how those properties have been used
Stratification of Neven Šegvić’s Architecture
No full textAutor članka bavi se istraživanjem opusa arhitekta Nevena Šegvića. U trijadi njegova djela – arhitektonski rad, teorijski rad, pedagoški rad – tekst obrađuje problematiku samo prvog segmenta. Primjenom kronološkoga kriterija očitavanja kataloga autor sagledava vrijednost pojedinačnoga djela unutar duktusa cjelovitoga stvaralačkog opusa. Verifikacijom i valorizacijom radova te uspostavom stratifikacije elaborira se teza o postojanju pet problemsko- -razvojnih faza arhitektonskog opusa Nevena Šegvića.This article is a study of Neven Šegvić’s architecture focusing on his architectural achievements as one of the three main subject areas of his work (along with his theory and teaching). The author evaluates each work within the entire collection through a chronological study of catalogues. Through the analysis and assessment of Šegvić’s works and stratification, the author elaborates his thesis of five development stages in Šegvić’s architectural career
Floppy-Sized Group Signatures from Lattices
No full textWe present the first lattice-based group signature scheme whose cryptographic artifacts are of size small enough to be usable in practice: for a group of 225225 users, signatures take 910 kB and public keys are 501 kB. Our scheme builds upon two recently proposed lattice-based primitives: the verifiable encryption scheme by Lyubashevsky and Neven (Eurocrypt 2017) and the signature scheme by Boschini, Camenisch, and Neven (IACR ePrint 2017). To achieve such short signatures and keys, we first re-define verifiable encryption to allow one to encrypt a function of the witness, rather than the full witness. This definition enables more efficient realizations of verifiable encryption and is of independent interest. Second, to minimize the size of the signatures and public keys of our group signature scheme, we revisit the proof of knowledge of a signature and the proofs in the verifiable encryption scheme provided in the respective papers
Floppy-Sized Group Signatures from Lattices
No full textWe present the first lattice-based group signature scheme whose cryptographic artifacts are of size small enough to be usable in practice: for a group of users, signatures take 910 kB and public keys are 501 kB. Our scheme builds upon two recently proposed lattice-based primitives: the verifiable encryption scheme by Lyubashevsky and Neven (Eurocrypt 2017) and the signature scheme by Boschini, Camenisch, and Neven (IACR ePrint 2017). To achieve such short signatures and keys, we first re-define verifiable encryption to allow one to encrypt a function of the witness, rather than the full witness. This definition enables more efficient realizations of verifiable encryption and is of independent interest. Second, to minimize the size of the signatures and public keys of our group signature scheme, we revisit the proof of knowledge of a signature and the proofs in the verifiable encryption scheme provided in the respective papers
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