Content for TS 43.020 Word version: 18.0.0
2 Subscriber identity confidentiality
2.1 Generality
2.2 Identifying method
2.3 Procedures
3 Subscriber identity authentication
3.1 Generality
3.2 The authentication procedure
3.3 Subscriber Authentication Key management
4 Confidentiality of signalling information elements, connectionless data and user information elements on physical connections
4.1 Generality
4.2 The ciphering method
4.3 Key setting
4.4 Ciphering key sequence number
4.5 Starting of the ciphering and deciphering processes
4.6 Synchronization
4.7 Handover
4.8 Negotiation of A5 algorithm
4.9 Support of A5 Algorithms in MS
4.10 Support of A5 Algorithms in the BSS
5 Synthetic summary
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2 Subscriber identity confidentiality p. 12
2.1 Generality p. 12
2.2 Identifying method p. 12
2.3 Procedures p. 12
2.3.1 Location updating in the same MSC area p. 12
2.3.2 Location updating in a new MSCs area, within the same VLR area p. 13
2.3.3 Location updating in a new VLR; old VLR reachable p. 14
2.3.4 Location Updating in a new VLR; old VLR not reachable p. 15
2.3.5 Reallocation of a new TMSI p. 16
2.3.6 Local TMSI unknown p. 17
2.3.7 Location updating in a new VLR in case of a loss of information p. 18
2.3.8 Unsuccessful TMSI allocation p. 18
2.3.9 Combined location area updating with the routing area updating p. 19
3 Subscriber identity authentication p. 20
3.1 Generality p. 20
3.2 The authentication procedure p. 20
3.3 Subscriber Authentication Key management p. 21
3.3.1 General authentication procedure p. 21
3.3.2 Authentication at location updating in a new VLR, using TMSI p. 22
3.3.3 Authentication at location updating in a new VLR, using IMSI p. 23
3.3.4 Authentication at location updating in a new VLR, using TMSI, TMSI unknown in "old" VLR p. 24
3.3.5 Authentication at location updating in a new VLR, using TMSI, old VLR not reachable p. 25
3.3.6 Authentication with IMSI if authentication with TMSI fails p. 25
3.3.7 Re-use of security related information in failure situations p. 25
4 Confidentiality of signalling information elements, connectionless data and user information elements on physical connections p. 26
4.1 Generality p. 26
4.2 The ciphering method p. 27
4.3 Key setting p. 27
4.4 Ciphering key sequence number p. 28
4.5 Starting of the ciphering and deciphering processes p. 28
4.6 Synchronization p. 29
4.7 Handover p. 29
4.8 Negotiation of A5 algorithm p. 29
4.9 Support of A5 Algorithms in MS p. 30
4.10 Support of A5 Algorithms in the BSS |R13| p. 30
5 Synthetic summary p. 31
