2 citations · 2 across the 14 of their papers we have counts for
8 papers · 1 filter
Send and Pretend: Exploiting Transcript Consistency Issues in End-to-End Encrypted Group Chats
Gabriel K. Gegenhuber, Moritz Grefner, Maximilian Günther +3
End-to-end encrypted (E2EE) messaging apps are widely praised for their security and thus also used for sensitive coordination in group chats (e.g., by political decision makers).…
A Relay a Day Keeps the AirTag Away: Practical Relay Attacks on Apple's AirTags
Gabriel K. Gegenhuber, Leonid Liadveikin, Florian Holzbauer +1
Apple AirTags use Apple's Find My network: when nearby iDevices detect a lost tag, they anonymously forward an encrypted location report to Apple, which the tag's owner can then fe…
Context Matters: Repository-Aware Security Analysis of the Agent Skill Ecosystem
Florian Holzbauer, David Schmidt, Gabriel Gegenhuber +2
Agent skills extend local AI agents, such as Claude Code and OpenClaw, with additional functionality. Their growing popularity has led to dedicated marketplaces resembling mobile a…
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…