Second Summary Report on Two-party Protocols Second Summary Report on Two-party Protocols

This report focuses on secure two-party protocols. We consider different notions of security and discuss the most attractive models and set-up assumptions (e.g., random oracle, common reference string, bare public keys, trusted computing base) that have been proposed so far. We consider many popular two-party games (e.g., zero-knowledge proof systems, commitment schemes, oblivious transfer, fair exchange), and for each of them we present the current stateof-the-art and stress the most important open problems. Finally we overview the implications on practical protocols.