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New Anonymity Notions for Identity-Based Encryption

Malika Izabachène 1, 2 David Pointcheval 1, 2
2 CASCADE - Construction and Analysis of Systems for Confidentiality and Authenticity of Data and Entities
DI-ENS - Département d'informatique de l'École normale supérieure, Inria Paris-Rocquencourt, CNRS - Centre National de la Recherche Scientifique : UMR 8548
Abstract : Identity-based encryption is a very convenient tool to avoid key management. Recipient-privacy is also a major concern nowadays. To combine both, anonymous identity-based encryption has been proposed. This paper extends this notion to stronger adversaries (the authority itself). We discuss this new notion, together with a new kind of non-malleability with respect to the identity, for several existing schemes. Inter- estingly enough, such a new anonymity property has an independent application to password-authenticated key exchange. We thus come up with a new generic framework for password-authenticated key exchange, and a concrete construction based on pairings.
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Submitted on : Tuesday, September 22, 2009 - 4:21:25 PM
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Malika Izabachène, David Pointcheval. New Anonymity Notions for Identity-Based Encryption. V. Cortier and C. Kirchner and M. Okada and H. Sakurada. Formal to Practical Security, LNCS 5458, Springer-Verlag, pp.138--157, 2009, Lecture notes in computer science. ⟨inria-00419144⟩

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