Section: 3.2 Symbols
Content: For the purposes of the present document, the following symbols apply: || Concatenation Å Exclusive or f1 Message authentication function used to compute MAC f1* Message authentication function used to compute MAC-S f2 Message authentication function used to compute RES and XRES f3 Key generating function used to compute CK f4 Key generating function used to compute IK f5 Key generating function used to compute AK in normal procedures f5* Key generating function used to compute AK in re-synchronisation procedures K Long-term secret key shared between the USIM and the AuC