Some Remarks on a Fair Exchange Protocol

Fair exchange turns out to be an increasingly important topic due to the rapid growth of electronic commerce An exchange is deemed to be fair if at the end of exchange either each party receives the expected item or neither party receives any useful information about the other s item Several protocols for fair exchange have been proposed in recent years In this paper we rst examine a newly published fair exchange protocol and point out its aws and weaknesses We then put forward a more e cient and secure protocol and give an informal analysis