In a system for performing an action regarding an account comprising entity information in response to an electronic communication received from a sender by a receiver, wherein the electronic communication includes sender identity information associated with the account and a digital signature derived...http://www.google.de/patents/US20050005124?utm_source=gb-gplus-sharePatent US20050005124 - SENDING ELECTRONIC TRANSACTION MESSAGE FOR ENTITY INFORMATION ACCOUNT, DIGITAL SIGNATURE DERIVED THEREFROM, AND SENDER IDENTITY INFORMATION IN AADS SYSTEM
