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Mécanismes cryptographiques pour la génération de clefs et l'authentification.

Abstract : Several cryptographic tools are required to establish an authenticated channel. In this thesis, we are interested in the security of some of them, used at different levels of the protocol which establishes the channel. In the first part, we analyze two algorithms which, used together, establish a channel which guarantees privacy, authentication and integrity: an authenticated key exchange protocol and an authenticated encryption scheme. The first one allows to generate keys using several authentication factors (biometrics, password, secure device). The second one is a standardized algorithm call CCM. In the second part, we are interested more particularly by the key extraction phase, phase which occurs between key exchange and the establishment of the secure channel. We present a simple method to extract a symmetric key from a Diffie-Hellman element, and then analyze HMAC as a computationnal randomness extractor. In the third part, we analyze some hash function operating modes. More precisely, we examin the security of a fixed-key blockcipher based operating mode and then study operating modes which tries to guarantee an optimal second preimage resistance.
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Submitted on : Wednesday, July 21, 2010 - 3:18:03 PM
Last modification on : Thursday, March 17, 2022 - 10:08:24 AM
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  • HAL Id : pastel-00004271, version 1



Sébastien Zimmer. Mécanismes cryptographiques pour la génération de clefs et l'authentification.. Informatique [cs]. Ecole Polytechnique X, 2008. Français. ⟨pastel-00004271⟩



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