Handovers:
Between 1 and 2 – Inter BTS / Intra BSC.
Between 1 and 3 – Inter BSC/ Intra MSC.
Between 1 and 4 – Inter MSC.
Security in GSM:
On air interface, GSM uses encryption and TMSI instead of IMSI.
SIM is provided 4-8 digit PIN to validate the ownership of SIM.
3 algorithms are specified :
- A3 algorithm for authentication
- A5 algorithm for encryption
- A8 algorithm for key generation
- A5 algorithm for encryption
- A8 algorithm for key generation
No comments:
Post a Comment