security electronic commerce protocol by the third kind entites，成果详细信息-全讯担保网

in e-commerce protocols, malicious participantsmisbehave on their benefits. there is some work in analysisthe application-protocols but little similar work about thefoundation-protocols. to fill the gap we use semi-regularentities to denote the entities different from penetrators thatparticipate in the protocol on behalf of themselves such ascustomers in e-commerce. a method in strand space model isalso presented. after descriptions of hash and diffie-hellmanexchange, semi-regular strand and semi-regular node areadded into the model, finally is an attack on the internet keyexchange (ike) protocol as a case.