Section: B.6 Derivation of CK'PS || IK'PS from CKCS || IKCS
Content: This input string is used for UMTS subscribers when there is a need to derive CK'PS || IK'PS from CKCS || IKCS during mapping the security contexts from UTRAN/GERAN to HSPA. The input parameter Key is the concatenation of CKCS || IKCS (which are 128 bits each), and the output is CK'PS ||IK'PS (which are 128 bits each). - FC = 0x33 - P0 = NONCEMSC - L0 = length of NONCEMSC (i.e. 0x00 0x10) Further, the GPRS Kc' used in GERAN shall be derived from CK'PS||IK'PS using the key conversion function c3 defined in this specification.