A system according to an embodiment of the invention provides a means whereby a user or user device may be authenticated by an identity provider. The authentication may provide a trust relationship between the user and a service provider. An IdentityCard, a virtual version of traditional ID cards seamlessly...http://www.google.com/patents/US20030172090?utm_source=gb-gplus-sharePatent US20030172090 - Virtual identity apparatus and method for using same
