Section: 5.3.10 Security Function 5.3.10.1 General
Content: The security functions include: - Guards against unauthorised EPS service usage (authentication of the UE by the network and service request validation). - Provision of user identity confidentiality (temporary identification and ciphering). - Provision of user data and signalling confidentiality (ciphering). - Provision of origin authentication of signalling and user data (integrity protection). - Authentication of the network by the UE. Security-related network functions for EPS are described in TS 33.401[ 3GPP System Architecture Evolution (SAE); Security architecture ]  [41]. The aspects of user plane data integrity protection that involve interactions with the 5G Core are specified in TS 23.501[ System architecture for the 5G System (5GS) ]  [83] and TS 23.502[ Procedures for the 5G System (5GS) ]  [84].