Efficiency tradeoffs for malicious two-party computation

Abstract

We study efficiency tradeoffs for secure two-party computation in presence of malicious behavior. We investigate two main approaches for defending against malicious behavior in Yao's garbled circuit method: (1) Committed-input scheme, (2) Equality-checker scheme. We provide asymptotic and concrete analysis of communication and computation costs of the designed protocols. We also develop a weaker definition of security (k-leaked model) for malicious two-party computation that allows for disclosure of some information to a malicious party. We design more efficient variations of Yao's protocol that are secure in the proposed model. © International Association for Cryptologic Research 2006.