Title

Strongly Leakage-Resilient Authenticated Key Exchange

RIS ID

119449

Publication Details

Chen, R., Mu, Y., Yang, G., Susilo, W. & Guo, F. (2016). Strongly Leakage-Resilient Authenticated Key Exchange. In K. Sako (Ed.), Topics in Cryptology - CT-RSA 2016 (pp. 19-36). Cham, Switzerland: Springer.

Abstract

Authenticated Key Exchange (AKE) protocols have been widely deployed in many real-world applications for securing communication channels. In this paper, we make the following contributions. First, we revisit the security modelling of leakage-resilient AKE protocols, and show that the existing models either impose some unnatural restrictions or do not sufficiently capture leakage attacks in reality.We then introduce a new strong yet meaningful security model, named challenge-dependent leakage-resilient eCK (CLR-eCK) model, to capture challenge-dependent leakage attacks on both long-term secret key and ephemeral secret key (i.e., randomness). Second, we propose a general framework for constructing one-round CLR-eCK-secure AKE protocols based on smooth projective hash functions (SPHFs). Finally, we present a practical instantiation of the general framework based on the Decisional Diffie-Hellman assumption without random oracle. Our result shows that the instantiation is efficient in terms of the communication and computation overhead and captures more general leakage attacks.

Grant Number

ARC/DE150101116

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