3GPP TS 03.21 – Cryptological Algorithms 3GPPTS03_series03.21 SPECIFICATION WITHDRAWN Related SpecTS 03.20 Security-related network functionsTS 03.20ext Security-related fetwork functions (Ext)TS 03.22 Functions related to Mobile Station (MS) in idle mode and group receive modeTR 03.26 Multiband operation of GSM/DCS 1800 by a single operator