The Running-Mode Analysis of Two-Party Optimistic Fair Exchange Protocols

摘要

In this paper, we present a method of running-mode to analyze the fairness of two-party optimistic fair exchange protocols. After discussing the premises and assumptions of analysis introduced in this technique, we deduce all the possible running modes that may cause attack on the protocols. Then we illustrate our technique on the Micali's Electronic Contract Signing Protocol (ECS1), and the checking results show that there are three new attacks on the protocol.