METHOD AND SYSTEM FOR RETRIEVING SERVICE KEY

摘要

A method for retrieving a service key, includes: the NAF determining the service to be initiated, and sending a push service key request to the BSF; the BSF computing to obtain the push service key based on the retrieved push service Ks using the push service key computing method, and returning the push service key to the NAF, the NAF sending the push message to the UE; the UE computing to obtain the push service key. A system for retrieving a service key, includes: the NAF, the BSF and the UE. The method and the system prevent the NAF which doesn't subscribe for Push service from using the Push service, and prevent the NAF from pretending the service actively initiated by the UE with the Push service.