The buyer and seller exchange authentication data provided by their security systems to authenticate the transaction. Back Office Transaction, Third Party Security Service. Buyer authenticates with security service. Security service provides authentication document to buyer. Seller authenticates with security service.
Security service provides authentication document to seller.
Buyer and seller execute transaction, providing authentication documents to each other. A Web user requests a dynamic resource from a Web server. The Web server passes authentication information to an application so that the application can check the user's authorization to execute a method. Web user authenticates with enterprise security system. Note that authentication may be through e.g. the Web server.