Local area nework encryption decryption system

Claim 1

A data encryption and/or decryption system comprising: (a) means for storing encryption and/or decryption keys, (b) an encryption and/or decryption processor for receiving data signals, for receiving said key or keys from the storing means, and for encrypting or decrypting the data signals in accordance with said key or keys, (c) an output data bus for receiving the encrypted or decrypted signals from said processor, (d) means for plugging said system into a read-only memory (ROM) socket of a computer for access to a source of said data signals and to said output data bus, (e) said source of data signals being a ROM socket address bus accessible by a computer micro-processor, and said encrypted data signals being applied to said data bus, said output data bus being accessible to the computer microprocessor, (f) a local area network (LAN) adapter system for connection to the computer containing said ROM socket, said ROM socket being a socket, designated for a boot ROM for the computer, in said LAN adapter system for booting the computer from the boot ROM of said LAN adapter, whereby said data signals are received, and encrypted data signals are passed through said ROM socket.