FIELD: radio engineering.
SUBSTANCE: method to generate a joint cryptographic switch protected against manipulation between two nodes (2-1, 2-2) via a radio interface (3). Besides, at least one of both nodes (2-1, 2-2) in process of generation of a common cryptographic switch (S) in the time interval of generation monitors whether the third node (9) communicates with one of both nodes (2-1, 2-2) via the radio interface (3). Both nodes (2-1, 2-2) generate a joint cryptographic switch according to the switch matching protocol by means of exchange of predetermined messages of switch matching along the radio channel of the radio interface (3). At the same time the monitoring node (2-2) monitors several radio channels of the radio interface (3), whether messages of switch matching are sent by means of the third node (9) to one of both nodes (2-1, 2-2) via the radio interface (3).
EFFECT: improved cryptographic protection.
10 cl, 5 dwg
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