A data encryption/decryption device (20) for a host computer (10) has an encryption/decryption module (22) which is hard wired with an infrared interface (24) capable of communicating with an infrared interface (14) at the host computer (10). The device (20) is for encrypting/decrypting data received from the computer (10) and transmitting it back to the computer (10), all via the infrared wireless communication link. The device (20) is in the form of a "credit card" sized token.
