VERFAHREN, SYSTEM UND EINRICHTUNG ZUM BEHANDELN ÜBER EINEN VON UE UND EXTERNEN GERÄTEN GEMEINSAM BENUTZTEN CHIFFRIERSCHLÜSSEL

摘要

A method for negotiating about cipher key shared by UE and external equipment includes: the external equipment transmits the cipher key negotiating request which including the identification of the external equipment to the UE; the UE calculates the first local interface shared cipher key based on the shared key (Ks) between the UE and the BSF and the identification of the external equipment; the network side calculates the second local interface shared cipher key based on the shared key (Ks) between the UE and the BSF, and the obtained identification of the external equipment, then provides the second local interface shared cipher key to the external equipment. A system and device for negotiating about cipher key shared by UE and external equipment.