A transaction network contains a networked certificate authority, by which one or more virtual certificates may be remotely defined and stored, such as by an issuer user through a issuer web portal interface. An acquirer user, through an acquirer web portal interface, may acquire one or more virtual...http://www.google.se/patents/US7899755?utm_source=gb-gplus-sharePatent US7899755 - Secure system for the issuance, acquisition, and redemption of certificates in a transaction network
