A system which uses three way password authentication, and s.sup.3 DES to encrypt different portions of a logon packet with different keys based on the nature of the communications link. Nodes attached to a particular LAN can have one level of security for data transfer within the LAN while data transfers...http://www.google.es/patents/US5638448?utm_source=gb-gplus-sharePatente US5638448 - Network with secure communications sessions
