International Association for Cryptologic Research

International Association
for Cryptologic Research

CryptoDB

Emmanuel Bresson

Affiliation: AIRBUS CyberSecurity

Publications

Year
Venue
Title
2007
CRYPTO
2007
PKC
2006
PKC
2006
EPRINT
On Security Models and Compilers for Group Key Exchange Protocols
Emmanuel Bresson Jörg Schwenk Mark Manulis
Group key exchange (GKE) protocols can be used to guarantee confidentiality and group authentication in a variety of group applications. The notion of provable security subsumes the existence of an abstract formalization (security model) that considers the environment of the protocol and identifies its security goals. The first security model for GKE protocols was proposed by Bresson, Chevassut, Pointcheval, and Quisquater in 2001, and has been subsequently applied in many security proofs. Their definitions of AKE- and MA-security became meanwhile standard. In this paper we analyze the BCPQ model and some of its later appeared modifications and identify several security risks resulting from the technical construction of this model – the notion of partnering. Consequently, we propose a revised model with extended definitions for AKE- and MA-security capturing, in addition, attacks of malicious protocol participants. Further, we analyze some well-known generic solutions (compilers) for AKE- and MA-security of GKE protocols proposed based on the definitions of the BCPQ model and its variants and identify several limitations resulting from the underlying assumptions. In order to remove these limitations and at the same time to show that our revised security model is in fact practical enough for the construction of reductionist security proofs we describe a modified compiler which provides AKE- and MA-security for any GKE protocol, under standard cryptographic assumptions.
2004
PKC
2004
PKC
2003
ASIACRYPT
2002
ASIACRYPT
2002
CRYPTO
2002
EUROCRYPT
2002
EPRINT
Security Proofs for an Efficient Password-Based Key Exchange
Password-based key exchange schemes are designed to provide entities communicating over a public network, and sharing a (short) password only, with a session key (e.g, the key is used for data integrity and/or confidentiality). The focus of the present paper is on the analysis of very efficient schemes that have been proposed to the IEEE P1363 Standard working group on password-based authenticated key-exchange methods, but for which actual security was an open problem. We analyze the AuthA key exchange scheme and give a complete proof of its security. Our analysis shows that the AuthA protocol and its multiple modes of operation are provably secure under the computational Diffie-Hellman intractability assumption, in both the random-oracle and the ideal-cipher models.
2001
ASIACRYPT
2001
PKC

Program Committees

Crypto 2015
PKC 2011