Section: 5.8.2 Subscriber privacy related requirements to UDM and SIDF
Content: The SIDF is responsible for de-concealment of the SUCI and shall fulfil the following requirements: - The SIDF shall be a service offered by UDM. - The SIDF shall resolve the SUPI from the SUCI based on the protection scheme used to generate the SUCI. The Home Network Private Key used for subscriber privacy shall be protected from physical attacks in the UDM. The UDM shall hold the Home Network Public Key Identifier(s) for the private/public key pair(s) used for subscriber privacy. The algorithm used for subscriber privacy shall be executed in the secure environment of the UDM.