GPRS builds on the proved authentication and security model used by GSM. At session initiation, a user is authenticated using secret information contained on a smart card called a Subscriber Identity Module (SIM). Authentication data is exchanged and validated with records stored in the HLR network node. GPRS enables additional authentication using protocols such as RADIUS before the subscriber is allowed access to the Internet or corporate data networks. GPRS supports the ciphering of user data across the wireless interface from the mobile terminal to the SGSN. In addition, higher level, end to end VPN encryption may take place when a user connects to a private corporate network.
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