Secure telephone terminal

Details Secure telephone terminal Secure telephone terminal

1986-07-03

1990-04-24

Buczinski, Stephen C.

Cryptography

Communication system using cryptography

Wireless communication

380 9, 380 23, 379 95, 379 98, 379407, H04M 1100, H04L 900

Patent

active

049205676

ABSTRACT:
A secure Telephone Terminal apparatus and method is disclosed which permits clear analog or coded digital message signals to operate on a non-secure telephone network having conventional equipment. This Telephone Terminal is utilized as a Remote Interface at the location of each predetermined telephone subscriber authorized to receive and transmit coded message signals. Included within the Telephone Terminal is a telephone line interface, a telephone interface, a signal converting stage, and a mode selector, or controller. By utilizing a duplexer in the telephone interface and telephone line interface, the controller utilizes separate inbound and outbound signal paths to determine if a coded message signal is about to be received and switches the mode accordingly. This permits either subscriber to select the coded mode regardless of which subscriber initially set up the call. Moreover, such an arrangement is compatible for signalling between different networks, such as a radio network and a telephone network, so that mobile subscribers and telephone subscribers may exchange message signals in a secure manner.

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