LTE security is based on a shared secret key K between the USIM and the HSS. The UE, the eNodeB and the MME derive keys for encryption and integrity protection from K.
The derived keys are used for:
- NAS encryption and integrity protection
- RRC encryption and integrity protection
- User plane encryption
The key derivation and the key exchange call flow is described in the following link:
LTE security procedure: authentication, encryption and integrity protection
July 23, 2012 at 2:08 pm
Reblogged this on ytd2525.