METHOD AND DEVICE FOR SUPPORTING SECURITY OF APPLICATION BY USING NAS MESSAGE IN WIRELESS COMMUNICATION SYSTEM

The present disclosure relates to a technique of supporting security in a wireless communication system. According to an embodiment of the disclosure, in case that a master key of a security key is generated at an authentication server function (AUSF) according to a message for notifying about expiration of the security key used in communication between the UE and an application function (AF) being received at the AUSF, the UE may receive an authentication request message including random number information used in generation of the masker key from an access and mobility management function (AMF) connected to the AUSF, may transmit an authentication request response message, based on reception of the authentication request message, and may generate the master key, based on the received random number information, wherein the authentication request message is transmitted from the AMF to the UE when a key refresh triggering message including the random number information is received by the AMF from the AUSF.