UNAUTHORIZED DATA ACCESS PROTECTION METHOD USING NOISE-LIKE SIGNALS Russian patent published in 2003 - IPC

FIELD: electrical communications; unauthorized data access protection using two simultaneously transferred noise-like signals. SUBSTANCE: leading and lagged noise-like signals as well as data signal whose variation mechanism is functionally associated with data transferred are shaped during transmission and delay time between lagged and leading noise-like signals is formed obeying data signal variation law; during reception data signal is separated, sequentially compensating and changed delays are introduced in leading noise-like signal received, leading and lagging noise-like signals are multiplied followed by integration of multiplication results; in the process mechanism of data signal variation is understood by amount of compensating delay corresponding to maximum of integration results. EFFECT: enhanced reliability of data protection against unauthorized access. 1 cl, 1 dwg