How is encryption utilized in GSM?

GSM networks utilize encryption for three purposes:

• Authentication
• Encryption
• Key generation

GSM Security FAQ

• How is encryption utilized in GSM?
• What algorithm is utilized for authentication in GSM networks?
• What algorithm is utilized for encryption in GSM networks?
• What algorithm is used for key generation in GSM networks?
• What are the components of a GSM network
• What are Ki, Kc, RAND, and SRES?
• How do Authentication and Key generation work in a GSM network?
• Have the A3 and A8 algorithms been broken?
• Have the A5 algorithms been broken?
• What are locking and unlocking?
• What is an IMEI?
• How can I find my IMEI?
• What is an IMSI?
• What is a TIMSI?
• What are the PIN and PUK?
• How do I change my PIN and PUK?
• How do I use CallerID?
• What is a Subscriber Identity Module (SIM)?