Ciphering in GSM:

Ciphering in GSM is used for encryption of data and speech on the Air-interface between the mobile station and the BTS. Before Ciphering can be aquired, sucessful authentication is necessary. The various steps that are needed to trigger ciphering are described in the figure below. Please move your mouse over the various buttons to obtain more information.

For more information about the various implements in the Ciphering Procedure see also for Kc, CKSN,

[2GTS 03.20]