Security apparatus and method for computers connected to telepho

Details Security apparatus and method for computers connected to telepho Security apparatus and method for computers connected to telepho

1988-05-04

1990-02-27

Buczinski, Stephen C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 49, 379 95, 34082531, 34082534, H04K 100

Patent

active

049052810

ABSTRACT:
A security apparatus for interfacing a computer system with a telephone circuit includes a modem and a controller interfacing between the telephone circuit and a modem of the computer system. The first-mentioned modem and the controller operate to answer incoming calls in a manner to disguise that the telephone circuit is connected to a computer system, thereby masking or hiding the computer system from unauthorized users such as "hackers."

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patent: 4601011 (1986-07-01), Grynberg
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patent: 4679226 (1987-07-01), Muehleisen
patent: 4700378 (1987-10-01), Brown
patent: 4763351 (1988-08-01), Lipscher et al.
Friend et al., Understanding Data Communications; p. 4-1, "Why Data Can't Be Transmitted Directly"; (Sams & Co.; Indianapolis; 1984).

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