A simple, secure and easy-to-deploy method and system for authenticating credit and debit cardholders at the point-of-sale on a computer network (e.g. the Internet) is disclosed. Cardholders are authenticated using digital signatures on a sales draft, in a manner that does not necessarily require any...http://www.google.de/patents/US7330836?utm_source=gb-gplus-sharePatent US7330836 - Method and system for secure authenticated payment on a computer network
