The present invention includes a first data processing device (node I) coupled to a first private network and to a firewall server (FWA). Firewall server FWA is in turn coupled to a public network, such as the Internet. A second data processing device (node J) is coupled to a second private network which...http://www.google.com/patents/US5416842?utm_source=gb-gplus-sharePatent US5416842 - Method and apparatus for key-management scheme for use with internet protocols at site firewalls
