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. Buyer security system provides authentication document to buyer.
Seller authenticates with seller security system.
Seller security system provides authentication document to seller. Buyer and seller execute transaction, providing authentication documents to each other. This scenario is similar to scenario 4. The same two parties, buyer and seller, wish to perform a transaction. In this case, however, each authenticates to a third-party security service responsible.