The present invention provides for determining point of interaction device security properties for secure transmission of a transaction between a plurality of electronic devices, such as point of interaction (POI) devices or computer systems (or both), over a public communication system, such as the...http://www.google.de/patents/US6286099?utm_source=gb-gplus-sharePatent US6286099 - Determining point of interaction device security properties and ensuring secure transactions in an open networking environment
