
This contribution presents an overview of the security of the 3rd generation mobile radio system UMTS as currently standardised by the 3rd Generation Partnership Project 3GPP. We discuss the underlying principles and show to which extent the security of 2nd generation systems as GSM is improved and enhanced by UMTS. The UMTS Authentication and Key Agreement protocol, the security algorithms deployed for UMTS and the interworking mechanisms between 2nd and 3rd generation systems are described in detail.
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