Section: 10.2.2.3.2 Handover
Content: When UE attempts to make Xn/N2 handover, UE and gNB derive and transfer the keys as normal to re-use the normal handover mechanism. Since the derived keys have no ability to affect the output of the NULL algorithms it is irrelevant that the network and the UE derive different keys. This implies that source gNB will forward UE 5G security capability which contains NIA0 and NEA0 only to target gNB. So the target gNB can only select NIA0 for integrity protection and NEA0 for confidential protection. If the UE does not receive any selection of new AS security algorithms during a intra-gNB-CU handover, the UE continues to use the same algorithms as before the handover (see TS 38.331[ NR; Radio Resource Control (RRC); Protocol specification ]  [22]).