Method and device for supporting user privacy protection in wireless communication system

An operating method of a serving network (SN) for supporting protection of a user's privacy in a wireless communication system, the operating method comprising:

• receiving, from a user equipment (UE), a registration request message comprising a subscription concealed identifier (SUCI);
• transmitting, to a home network (HN), the registration request message;
• receiving, from the HN, a first key obtained based on the SUCI;
• performing a non-access stratum security mode command (NAS SMC) procedure and a radio resource control security mode command (RRC SMC) procedure;
• generating a global unique temporary identifier (GUTI);
• and
• transmitting, to the UE, a registration accept message comprising the GUTI.

A home network (HN) for supporting protection of a user's privacy in a wireless communication system, the HN comprising:

• a transceiver;
• and
• at least one processor connected to the transceiver,
• wherein the at least one processor is configured to:
• receive, via the transceiver, from a serving network (SN), a registration request message comprising a subscription concealed identifier (SUCI), in response to a registration request of a user equipment (UE);
• obtain a first key, based on the SUCI;
• and
• transmit, via the transceiver, the first key to the SN.