Communication Terminal, Core Network Device, Core Network Node, Network Node And Key Deriving Method

Abstract: Provided is a communication terminal capable of preventing a reduction in security level that is caused at the time of establishing multiple connections via 3GPP Access and Non-3GPP Access. A communication terminal (10) according to the present disclosure includes: a communication unit (11) configured to communicat e with gateway devices disposed in a preceding stage of a core network device (20) via an Untrusted Non-3GPP Access; and a key derivation unit (12) configured to derive a second security key used for security processing of a message transmitted using a defined protocol with the gateway device, from a first security key used for security processing of a message transmitted using a defined protocol with the core network device (20).

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