FIELD: physics.
SUBSTANCE: invention relates to prevention of fraudulent telephone calls due to mutual authentication of mobile communication subscribers when establishing a connection. A dynamic password is used, which is a sequence of one or more acoustic signals transmitted during a given period after establishing a connection to a mobile communication terminal device of a subscriber receiving an incoming and outgoing call. Characteristics of the dynamic password are pre-agreed by the subscribers and include the moment of the beginning of the acoustic signal emission, and/or the acoustic signal frequency, and/or the acoustic signal amplitude, and/or number of time intervals of signal emission, and/or duration of each interval in which signal emission occurs, and/or duration of intervals between signal emissions, dynamic password is also processed by means of software pre-installed on the end mobile communication device of the subscriber receiving an incoming call and making an outgoing call.
EFFECT: high safety of mobile communication subscribers exchanging information by means of voice, due to high reliability of identifying the identity of the subscriber making an incoming call.
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