A Denial-of-Service Attack to GSM/UMTS Networks via Attach Procedure

In this thesis I describe an attack to the security of a Public Land Mobile Network allowing an unauthenticated malicious mobile device to inject traffic in the mobile operator's infrastructure. I show that using a few hundreds of malicious devices and without any SIM module it is possible to inject in the mobile infrastructure high levels of signalling traffic targeted at the Home Location Register, thus causing significant service degradation up to a full-fledged Denial-of-Service attack.