Apparatus and methods, readily adapted to interface with a standard data transmission network having an unsecure transmission channel, e.g., "Ethernet," for the provision of secure transmission of data over the network channel in a manner which is essentially transparent to the standard network devices...http://www.google.es/patents/US4881263?utm_source=gb-gplus-sharePatente US4881263 - Apparatus and method for secure transmission of data over an unsecure transmission channel
Apparatus and method for secure transmission of data over an unsecure ...
