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Article

Resource fairness and composability of cryptographic protocols

Authors:

Philip MacKenzie,

Manoj Prabhakaran,

Ke YangAuthors Info & Claims

TCC'06: Proceedings of the Third conference on Theory of Cryptography

Pages 404 - 428

https://doi.org/10.1007/11681878_21

Published: 04 March 2006 Publication History

Abstract

We introduce the notion of resource-fair protocols. Informally, this property states that if one party learns the output of the protocol, then so can all other parties, as long as they expend roughly the same amount of resources. As opposed to similar previously proposed definitions, our definition follows the standard simulation paradigm and enjoys strong composability properties. In particular, our definition is similar to the security definition in the universal composability (UC) framework, but works in a model that allows any party to request additional resources from the environment to deal with dishonest parties that may prematurely abort.

In this model we specify the ideally fair functionality as allowing parties to “invest resources” in return for outputs, but in such an event offering all other parties a fair deal. (The formulation of fair dealings is kept independent of any particular functionality, by defining it using a “wrapper.”) Thus, by relaxing the notion of fairness, we avoid a well-known impossibility result for fair multi-party computation with corrupted majority; in particular, our definition admits constructions that tolerate arbitrary number of corruptions. We also show that, as in the UC framework, protocols in our framework may be arbitrarily and concurrently composed.

Turning to constructions, we define a “commit-prove-fair-open” functionality and design an efficient resource-fair protocol that securely realizes it, using a new variant of a cryptographic primitive known as “time-lines.” With (the fairly wrapped version of) this functionality we show that some of the existing secure multi-party computation protocols can be easily transformed into resource-fair protocols while preserving their security.

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Published In

cover image Guide Proceedings

TCC'06: Proceedings of the Third conference on Theory of Cryptography

March 2006

616 pages

ISBN:3540327312

Editors:
Shai Halevi
IBM Research, Hawthorne, NY
,
Tal Rabin
IBM T.J.Watson Research Center, Hawthorne, NY

Publisher

Springer-Verlag

Berlin, Heidelberg

Publication History

Published: 04 March 2006

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