System and method for communications security protection

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

H - Electricity

04

K

340/70

H04K 1/02 (2006.01) H04K 3/00 (2006.01)

Patent

CA 2033983

A system and method are disclosed for pre- venting intelligible interception of information sig- nals 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 informa- tion 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 receiv- ing detector is not confused.

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