Strong cryptography from weak secrets

Boyen, Xavier, Chevalier, Céline , Fuchsbauer, Georg, & Pointcheval, David (2010) Strong cryptography from weak secrets. Lecture Notes in Computer Science, 6055, pp. 297-315.

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Distributed-password public-key cryptography (DPwPKC) allows the members of a group of people, each one holding a small secret password only, to help a leader to perform the private operation, associated to a public-key cryptosystem. Abdalla et al. recently defined this tool [1], with a practical construction. Unfortunately, the latter applied to the ElGamal decryption only, and relied on the DDH assumption, excluding any recent pairing-based cryptosystems. In this paper, we extend their techniques to support, and exploit, pairing-based properties: we take advantage of pairing-friendly groups to obtain efficient (simulation-sound) zero-knowledge proofs, whose security relies on the Decisional Linear assumption. As a consequence, we provide efficient protocols, secure in the standard model, for ElGamal decryption as in [1], but also for Linear decryption, as well as extraction of several identity-based cryptosystems [6,4]. Furthermore, we strenghten their security model by suppressing the useless testPwd queries in the functionality.

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5 citations in Scopus
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4 citations in Web of Science®

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ID Code: 69180
Item Type: Journal Article
Refereed: Yes
Additional Information: Proceedings of the Third International Conference on Cryptology in Africa, Stellenbosch, South Africa, May 3-6, 2010.
Additional URLs:
Keywords: Data Encryption , Systems and Data Security
DOI: 10.1007/978-3-642-12678-9_18
ISSN: 0302-9743
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2010 Springer-Verlag Berlin Heidelberg
Copyright Statement: Author's Pre-print: author can archive pre-print (ie pre-refereeing)
Author's Post-print: author can archive post-print (ie final draft post-refereeing)
Publisher's Version/PDF: author cannot archive publisher's version/PDF
Deposited On: 25 Mar 2014 23:23
Last Modified: 02 Aug 2014 01:45

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