Patent ID: 6430691
Filing Date: 2002-08-06
Classification: H04K

Abstract:
A device for selectively encrypting transmissions comprising:a local port, a remote port and a serial I/O port; a first local modem coupled to said local port; a second remote modem coupled to said remote port; an audio codec coupled to said local port; an encryption/decryption unit for selectively encrypting and decrypting data; and, a microprocessor coupled to said local modem, remote modem, said audio codec and encryption/decryption unit, for operating said device in a first mode wherein audio and facsimile signals are passed between said local and remote ports in a substantially unaltered manner; a second mode wherein audio data received using said local port is digitized using said audio codec, encrypted using said encryption/decryption unit and modulated and transmitted using said remote modem and remote port; a third mode wherein facsimile signals received using said local port are demodulated using said local modem, encrypted using said encryption/decryption unit and modulated and transmitted using said remote modem; and a fourth mode wherein audio or facsimile signals are received using said local port, other data is simultaneously received using said serial I/O port and data indicative of said received audio or facsimile signals and other data is simultaneously encrypted using said encryption/decryption unit and modulated and transmitted using said remote modem.