Abstract: The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method and a first mission critical (MC) server are provided for managing security domain access information of migrated users in a private communication in MC services. A first MC server receives a private call request from an MC service user of a first UE for establishing the private communication with an MC service user of a second UE. It is determined whether the MC service user of the second UE is migrated from the first MC server to at least one secondary MC server. A private call redirection message is generated, and the private call redirection message is transmitted to the MC service user of the first UE to establish the private communication with the MC service user of the second UE based on the private call redirection message.

Abstract: The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Methods and devices in a wireless communication system are provided. System information is received from a base station. The system information includes information related to a public key of a base station. It is determined whether the public key corresponding to the information related to the public key is stored in the terminal. In case that the public key is stored in the terminal and the system information includes signature information of the base station, a signature of the base station is verified. The base station is connected to or another base station is searched for, based on whether the signature of the base station is verified.

Abstract: The disclosure relates to a 5th generation (5G) or 6th generation (6G) communication system for supporting a higher data transmission rate. The disclosure provides a base station authentication method which includes receiving system information from a base station, determining whether the system information includes signature information, in case that the signature information is not included, storing information of whether the signature information is included, obtaining information regarding signing capability for the system information of the base station, and determining whether to continue an attach procedure with the base station, based on at least one of the information of whether the signature information is included and the signing capability for the system information of the base station.

Abstract: The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method of a first terminal in a wireless communication system is provided. The method comprising: generating an AGK for an adhoc group; transmitting an adhoc group communication request message including a list including IDs of a plurality of second terminals included in the adhoc group and connected to the first server; receiving an adhoc group communication return message signed by the first server; performing an encryption and signing operation on the AGK based on first authentication information related to the first terminal and the second authentication information; transmitting an adhoc group communication security material request message including the AGK that is encrypted and signed; receiving an adhoc group communication response message in response to transmitting the adhoc group communication security material request message; and performing a secure communication.

Abstract: The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate.

Abstract: The disclosure relates to a 5th generation (5G) or pre-5G communication system for supporting a higher data rate than a beyond 4th generation (4G) communication system such as long term evolution (LTE). A user equipment (UE) in a wireless communication system may include a transceiver and at least one controller controlling the transceiver.

Abstract: A method and device for applying a different security policy, per service traffic, to a protocol data unit (PDU) session in a wireless communication system. The method comprises receiving, by a session management function (SMF) managing a session for a user equipment (UE), first configuration information about a first user plane security policy of the UE from a unified data management (UDM) managing subscription information about the UE, receiving, by the SMF, second configuration information about a second user plane security policy to be applied to a specific service data flow from a policy and control function (PCF) managing a policy and charging control (PCC) rule, and determining a user plane security policy to be applied to the UE based on one selected from the first user plane security policy and the second user plane security policy according to priority.