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1. (WO2018201398) METHOD AND DEVICE FOR ACQUIRING KEY AND COMMUNICATION SYSTEM

Pub. No.:    WO/2018/201398    International Application No.:    PCT/CN2017/083072
Publication Date: Fri Nov 09 00:59:59 CET 2018 International Filing Date: Fri May 05 01:59:59 CEST 2017
IPC: H04W 12/04
Applicants: HUAWEI TECHNOLOGIES CO., LTD.
华为技术有限公司
Inventors: CHEN, Jing
陈璟
PAN, Kai
潘凯
LI, He
李赫
Title: METHOD AND DEVICE FOR ACQUIRING KEY AND COMMUNICATION SYSTEM
Abstract:
Embodiments of the present application provide a plurality of methods and devices for acquiring a key, and a communication system. A target AMF entity uses an intermediate key sent by a source AMF entity to determine a communication key used between the target AMF entity and a terminal device, or the target AMF entity requests a new key from an authentication function entity to determine the communication key used between the target AMF entity and the terminal device; and the target AMF entity notifies the terminal device to derive a corresponding key, thus realizing key isolation between the target AMF entity and the source AMF entity, effectively avoiding security risks in the prior art, and improving network security.