Section: Annex G (normative): Support of algorithm change features
Content: UEA2 and UIA2 have been developed as back up algorithms which should be installed in RNCs as soon as possible so that they are available for use in the hopefully unlikely event that the current algorithms UEA1 and UIA1 become compromised. Therefore it is reasonable to expect that operators will have been able to upgrade all their RNCs before the new algorithms need to be enabled. Consequently, algorithm change is only required at inter-network handover. Based on the above assumptions, the following feature shall be supported: - Encryption/integrity algorithm change at SRNC relocation with hard inter-network handover. Based on the above assumptions, the following features do not have to be supported: - Encryption/integrity algorithm change at "UE not involved" SRNC relocation for both the DCH and FACH cases. NOTE: Only applies to intra-network case, since Iur is not supported between operators. - Encryption/integrity algorithm change at SRNC relocation with hard intra-network handover.