Cellular Network Security Table 12.1: Sample Case 1 Classification Interception Level I Observe time, rate, length, source, and destination of victim's locations. With modi- fied cellular devices, eavesdrop on victim. Fabrication/ Insertion Using modified cellu- lar devices, the adversary can send spurious registra- tion messages to the target network. Likewise, using mod- ified base stations, the adversary can signal victims to camp at their locations. Modification of Resources With a modified base station and cellular devices, the adversary modifies conversations between subscribers and their base stations. Denial of Service The adversary can cause DoS by sending a large number of fake registration messages. 317 Interruption Jam victims' traffic chan- nels so that victims can- not access the channels. Broadcast at a higher inten- sity than allowed, thereby hog- ging the bandwidth. 5. Cellular Network Vulnerability Analysis Regardless of how attacks are launched, if attack actions cause a system-acceptable