Computer security system

Details Computer security system Computer security system

1985-04-24

1988-08-09

Cangialosi, Salvatore

Telephonic communications

Telephone line or system combined with diverse electrical...

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

380 23, 380 25, H04L 900

Patent

active

047633514

ABSTRACT:
A computer security system employs a first telephone line for controlling a security unit which connects a second telephone line to the computer. Each authorized user must have a user security unit generating a control signal, such as an audio signal modulated by a pulse signal having a selectable pulse frequency, pulse duration and/or duration between pulses.

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patent: 4531023 (1985-07-01), Levine
patent: 4532377 (1985-07-01), Zink

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