Continuous after-the-fact leakage-resilient key exchange
Alawatugoda, Janaka, Boyd, Colin, & Stebila, Douglas (2014) Continuous after-the-fact leakage-resilient key exchange. In Information Security and Privacy: 19th Australasian Conference, ACISP 2014, Proceedings [Lecture Notes in Computer Science, Volume 8544], Springer, Wollongong, Australia, pp. 258-273.
Security models for two-party authenticated key exchange (AKE) protocols have developed over time to provide security even when the adversary learns certain secret keys. In this work, we advance the modelling of AKE protocols by considering more granular, continuous leakage of long-term secrets of protocol participants: the adversary can adaptively request arbitrary leakage of long-term secrets even after the test session is activated, with limits on the amount of leakage per query but no bounds on the total leakage. We present a security model supporting continuous leakage even when the adversary learns certain ephemeral secrets or session keys, and give a generic construction of a two-pass leakage-resilient key exchange protocol that is secure in the model; our protocol achieves continuous, after-the-fact leakage resilience with not much more cost than a previous protocol with only bounded, non-after-the-fact leakage.
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|Item Type:||Conference Paper|
|Keywords:||Leakage resilience, Continuous leakage, Key exchange, Security models, After-the-fact|
|Divisions:||Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Copyright Owner:||Copyright 2014 Please consult the authors|
|Deposited On:||01 May 2014 02:29|
|Last Modified:||25 Jul 2014 13:50|
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