A method, apparatus and computer program product may be provided for securing multiple NAS connections over a plurality of access types. An exemplary method may comprise receiving, at an access mobility function (AMF), a first registration request from user equipment (UE) over a first access type, establishing a main NAS context comprising at least a key set identifier for identifying a key for the AMF (KAMF), NAS integrity and encryption keys and a selected algorithm for all NAS links, wherein establishing the main NAS context comprises establishing the KAMF, and subsequently deriving, from the KAMF, the NAS integrity and NAS encryption keys and establishing a first NAS sub-context corresponding to a first access type, the first NAS sub-context comprising at least a first NAS link identification number, a first uplink packet count, a first downlink packet count.