FIELD: information technologies.
SUBSTANCE: detection of acoustic (speech) information leakage channel is carried out monitoring of optical radiations in standard fibre optic communications. For security departments appearance of any non-standard light radiations or occurrence of modulation at acoustic frequencies of standard light flows is a parameter of possible threat of voice information leakage and taking measures for their neutralisation. The device to realise this method comprises a receiver of optical radiation; a system of registration (demodulation) and analysis of received acoustic signals.
EFFECT: increased throughput capacity.
19 cl, 2 dwg
