| 摘要 |
FIELD: radio engineering, communication.SUBSTANCE: invention relates to means of detecting illegal use of a processing device of a security system, used to descramble various media data distributed over multiple corresponding channels. The method includes counting new messages ECM, received by the processing device of the security systems for channels, other than channel i, after the last received message ECM; verifying that the message ECMwas received during said time interval by verifying that the number of new messages ECM, received for channels other than i, reaches or exceeds a given threshold greater than two; increasing the counter Kchby the given value each time when after verification a message ECMis received during a given time interval, immediately after a message ECM, otherwise the counter Kchis reset to the initial value; detecting illegal use once the counter Kchreaches said threshold.EFFECT: reducing the probability of illegal use of a processing device.10 cl, 3 dwg |
