Cryptology ePrint Archive: Report 2011/204

Leakage Tolerant Interactive Protocols

Nir Bitansky and Ran Canetti and Shai Halevi

Abstract: We put forth a framework for expressing security requirements from interactive protocols in the presence of arbitrary leakage. This allows capturing different levels of leakage tolerance of protocols, namely the preservation (or degradation) of security, under coordinated attacks that include various forms of leakage from the secret states of participating components. The framework extends the universally composable (UC) security framework. We also prove a variant of the UC theorem, that enables modular design and analysis of protocols even in face of general, non-modular leakage.

We then construct leakage tolerant protocols for basic tasks, such as, secure message transmission, message authentication, commitment, oblivious transfer and zero knowledge. A central component in several of our constructions is the observation that resilience to adaptive party corruptions (in some strong sense) implies leakage-tolerance in an essentially optimal way.

Category / Keywords: cryptographic protocols / universal-composition, leakage-resilient-cryptography

Date: received 24 Apr 2011, last revised 28 Apr 2011

Contact author: nirbitan at tau ac il

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Version: 20110428:222549 (All versions of this report)

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