System and method for communications security protection

Details System and method for communications security protection System and method for communications security protection

1990-05-14

1990-11-20

Cangialosi, Salvatore

Cryptography

Equipment test or malfunction indication

380 6, H04K 102

Patent

active

049724690

ABSTRACT:
A system and method are disclosed for preventing intelligible interception of information signals transmitted over a two-direction line. A masking signal is applied through a hybrid circuit at the receiving end of the line, and this masking signal, which appears on the line together with the information signal, prevents intelligible decoding. The masking signal includes a series of frequencies which are sequentially applied. Only at the receiving end of the line, where the hybrid circuit attenuates the masking signal which it receives at its receive port, can intelligible decoding take place. The amplitude of the information signals is sensed at the receiving end and the amplitude of the masking signals on the line is adjusted to be great enough to provide security, by confusing an eavesdropping detector, yet small enough at the receiving end so that the receiving detector is not confused.

REFERENCES:
patent: 3600685 (1969-03-01), Doyle
patent: 3624297 (1972-03-01), Chapman
patent: 3651268 (1972-03-01), Rivkin
patent: 3654604 (1972-04-01), Crafton
patent: 3718765 (1973-02-01), Halaby
patent: 3985958 (1976-10-01), dudley
patent: 4160875 (1979-07-01), Kahn
patent: 4393276 (1983-07-01), Steele
patent: 4468667 (1984-08-01), Baylor
patent: 4625081 (1986-11-01), Lotito
patent: 4727568 (1988-02-01), Morishinia
patent: 4753205 (1986-02-01), Nash
patent: 4901348 (1990-02-01), Nichols et al.

Affiliated with

Also associated with

Rating

System and method for communications security protection does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with System and method for communications security protection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method for communications security protection will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-460366