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ESORICS
2012
Springer

Beyond eCK: Perfect Forward Secrecy under Actor Compromise and Ephemeral-Key Reveal

9 years 18 days ago
Beyond eCK: Perfect Forward Secrecy under Actor Compromise and Ephemeral-Key Reveal
We show that it is possible to achieve perfect forward secrecy in two-message key exchange (KE) protocols that satisfy even stronger security properties than provided by the extended Canetti-Krawczyk (eCK) security model. In particular, we consider perfect forward secrecy in the presence of adversaries that can reveal the long-term secret keys of the actor of a session and reveal ephemeral secret keys. We propose two new game-based security models for KE protocols. First, we formalize a slightly stronger variant of the eCK security model that we call eCKw . Second, we integrate perfect forward secrecy into eCKw , which gives rise to the even stronger eCK-PFS model. We propose a securitystrengthening transformation (i. e., a compiler) between our new models. Given a two-message Diffie-Hellman type protocol secure in eCKw , our transformation yields a two-message protocol that is secure in eCK-PFS. As an example, we show how our transformation can be applied to the NAXOS protocol.
Cas J. F. Cremers, Michele Feltz
Added 29 Sep 2012
Updated 29 Sep 2012
Type Journal
Year 2012
Where ESORICS
Authors Cas J. F. Cremers, Michele Feltz
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