Computer security guard circuit

Details Computer security guard circuit Computer security guard circuit

1985-06-17

1987-07-07

Rubinson, Gene Z.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379102, 379188, 178 2208, 380 25, H04M 1100, H04L 900

Patent

active

046792260

ABSTRACT:
A circuit (16) is designed to prevent unauthorized access to a remote device such as a computer (10) over a communications system such as a telephone network (12). A remote computer terminal (13) is connected to the telephone network (12) through a conventional modem (14). At the remote location of computer (10), circuit (16) is connected between computer (10) and another modem (15). Circuit (16) is also connected to the telephone network (12) to receive a signal therefrom which connects modem (15) through circuit (16) to computer (10) to temporarily access the same. The connection, however, is disconnected after a predetermined time period unless circuit (16) receives a second signal from the telephone network (12) before the expiration of that predetermined time period.

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patent: 4604499 (1986-08-01), Hughes

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