Security mechanism to interwork with standalone SEAF in 5G network

摘要

It relates to a method and network equipment for implementing a security mechanism for interworking with a standalone security anchor function (SEAF) in a 5G network. The method performed by the standalone SEAF comprises the steps of: receiving a first request for a key for securing communication between the UE 12 and a first access and mobility function (AMF) requesting registration, the request is the UE's comprising a first indication indicating whether standalone SEAF is supported; Receiving a second request for a key for securing communication between the UE and the second AMF from the second AMF, from which the UE requests registration in order to perform inter-AMF mobility for the second AMF, the request is independent SEAF support of the UE including a second indication indicating whether or not; determining whether a bid down attack has occurred depending at least in part on whether the first indication matches the second indication.