System and method for securing DTMF transmission

Details System and method for securing DTMF transmission System and method for securing DTMF transmission

1991-01-02

1992-12-01

Gregory, Bernarr E.

Cryptography

Cryptanalysis

380 23, 380 25, 380 49, H04K 102

Patent

active

051685191

ABSTRACT:
A technique for inhibiting intelligible interception of information signals transmitted over a line from a first site to a second site. A masking signal is applied to the line immediately upon the detection of the information signal at the second site, but prior to the time at which the validity of the signal is verified. As long as the information signal remains on the transmission line, the masking signal is repeatedly turned on and off to thereby inhibit decoding of the signal by an eavesdropping device.

REFERENCES:
patent: 2645677 (1953-07-01), Young, Jr.
patent: 3718765 (1973-02-01), Halaby

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