Various aspects of the present disclosure relate to key identification for mobile edge computing functions. An apparatus includes at least one memory and at least one processor that is configured to generate a unique key set identifier (“KSI”) associated with a multi-access edge computing (“MEC”) service, derive a key for a network function based on a corresponding root key and the generated KSI, the KSI provided as input to a key derivation function (“KDF”), and transmit an application registration request message to the network function for establishing a secure connection to the network function using the key, the application registration request message comprising the KSI.