2 citations · 2 across the 7 of their papers we have counts for
7 papers
Hey there! You are using WhatsApp: Enumerating Three Billion Accounts for Security and Privacy
Gabriel K. Gegenhuber, Philipp É. Frenzel, Maximilian Günther +2
WhatsApp, with 3.5 billion active accounts as of early 2025, is the world's largest instant messaging platform. Given its massive user base, WhatsApp plays a critical role in globa…
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…
Prekey Pogo: Investigating Security and Privacy Issues in WhatsApp's Handshake Mechanism
Gabriel K. Gegenhuber, Philipp É. Frenzel, Maximilian Günther +1
WhatsApp, the world's largest messaging application, uses a version of the Signal protocol to provide end-to-end encryption (E2EE) with strong security guarantees, including Perfec…
Careless Whisper: Exploiting Silent Delivery Receipts to Monitor Users on Mobile Instant Messengers
Gabriel K. Gegenhuber, Maximilian Günther, Markus Maier +4
With over 3 billion users globally, mobile instant messaging apps have become indispensable for both personal and professional communication. Besides plain messaging, many services…
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…
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…
Why E.T. Can't Phone Home: A Global View on IP-based Geoblocking at VoWiFi
Gabriel Karl Gegenhuber, Philipp Frenzel, Edgar Weippl
In current cellular network generations (4G, 5G) the IMS (IP Multimedia Subsystem) plays an integral role in terminating voice calls and short messages. Many operators use VoWiFi (…