3 papers
cs.CR2025
SIMulator: SIM Tracing on a (Pico-)Budget
Gabriel K. Gegenhuber, Philipp É. Frenzel, Adrian Dabrowski
SIM tracing -- the ability to inspect, modify, and relay communication between a SIM card and modem -- has become a significant technique in cellular network research. It enables e…
cs.CR2024
Diffie-Hellman Picture Show: Key Exchange Stories from Commercial VoWiFi Deployments
Gabriel Karl Gegenhuber, Florian Holzbauer, Philipp Frenzel +2
Voice over Wi-Fi (VoWiFi) uses a series of IPsec tunnels to deliver IP-based telephony from the subscriber's phone (User Equipment, UE) into the Mobile Network Operator's (MNO) cor…
cs.NI2024
Never Gonna Give You Up: Exploring Deprecated NULL Ciphers in Commercial VoWiFi Deployments
Gabriel Karl Gegenhuber, Philipp Frenzel, Edgar Weippl
In today's cellular network evolutions, such as 4G and 5G, the IMS (IP Multimedia Subsystem) serves as a crucial component in managing voice calls and handling short messages. Besi…