Crypto U12 (part 2), crypto for mobile telecom

1. generation
   1. user keys are generated by SIM manufacturer
   2. user keys installed on SIM
2. establishment
   1. established with user X when SIM is given to the user
   2. user key is also given to carrier by the SIM manufacturer
3. storage
   1. user key is stored on tamper resistant SIM
   2. session keys (encryption and MAC) thrown away after each use
4. usage
   1. user key only exposed briefly to encryt challenge response to base station

Anlagen:

• Crypto U12 GSM,UTMS Hierarchy Diagram