Section: 6.10.3.2 Derivation of keys
Content: The UE and MN shall derive the security key KSN of the SN as defined in Annex A.16 of the present document. The SN RRC and UP keys shall be derived from the KSN both at the SN and the UE using the function given in Annex A.7 of TS 33.401[ 3GPP System Architecture Evolution (SAE); Security architecture ]  [10] if the SN is a ng-eNB or using the function given in Annex A.8 of the present specification if the SN is a gNB. Once all the SN RRC and UP keys have been derived from the KSN, the SN and UE may delete the KSN.