FIELD: communication.
SUBSTANCE: intermediate key is formed by means of user equipment based on CK encryption key, IK integrity key and an indication identifier, a binding key is formed by means of user equipment based on the intermediate key, a lower level key Kamf is obtained by means of user equipment based on the binding key, and a base station key KgNB is obtained by means of user equipment based on Kamf.
EFFECT: formation of a unified binding key for different access modes, and separation between binding keys of different access mode and a lower level key formed based on the binding key.
47 cl, 26 dwg
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