FIELD: wireless communication equipment.
SUBSTANCE: invention relates to operation of a terminal device in a cellular communication network. Method of operation of a terminal device in a cellular communication network comprises sending a GMM message Request for connection to a network, a GMM Request for connection message identifies security capabilities of the terminal device, terminal device receives an echo message from the network at the GMM level, including information identifying security capabilities of the terminal device, wherein the echo message is received with integrity protection.
EFFECT: high efficiency of preventing attacks.
40 cl, 12 dwg
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