Abstract: A method and apparatus to protect the coded signals sent over physical twisted-pair wiring or between two (2) or more LANs connected by a Wide Area Network (WAN), from unauthorized electronic circuit/wiring monitoring. This is accomplished by varying the assignments of the standard Registered Jack communication pins, varying the transmission speed, inserting meaningless or unrelated data, encrypting data before it is sent or changing network protocol(s) on behalf of the communications adapter/controller of each computer to which it is attached on those LANs.