Destination Web site provides resource to Web user. Multiple destination sites can use the same authentication assertions to authenticate the Web user. Web user authenticates with security service. Web user requests resource from destination Web site, providing authentication reference. Destination Web site requests authentication document from security service, passing the Web user's authentication reference.
Security service provides authentication document to destination Web site.
Destination Web site provides resource to Web user. In this scenario, two parties, buyer and seller, wish to perform a transaction. They exchange authentication data provided by their security systems to authenticate the transaction. Back Office Transaction. Buyer authenticates with buyer security system.