FIELD: electric communications engineering.
SUBSTANCE: proposed method designed for protection of secret information against its unauthorized reading off two-wire communication lines involves following basic procedures: additional signal is generated on receiving end of communication line at instant of main signal initiation and on receiving end of communication line auxiliary voltage is produced from current flowing in communication line for recovering main signal; the latter is multiplied by factor proportional to communication line impedance and added to additional signal.
EFFECT: enhanced reliability of data protection without reducing digital data transfer speed.
3 cl, 3 dwg
