French government internal messaging tool Tchap hit by data breach — but it doesn't know if any data was…
- French government‑only chat app Tchap breached via stolen valid account, attacker claims 13.5GB exfiltrated
- Alleged haul includes 73k accounts, 640k+ messages, 800+ chat rooms; private chats encrypted, public rooms not
- ANSSI and DINUM investigating amid wider warnings about state‑targeted messaging‑app espionage
A chat app used exclusively by French government employees was apparently hacked and hundreds of thousands of messages allegedly exfiltrated, with the authorities now investigating these claims.
Back in 2025, France’s Prime Minister François Bayrou banned the use of foreign chat apps, such as WhatsApp or Signal, for work communication. Instead, employees were told to use Tchap, an instant messaging and collaboration tool built by DINUM, the digital affairs directorate of the French government, and ANSSI, France’s cybersecurity agency.
The app is a fork of Riot, and available only to users with a .gov address. Apparently, the app has more than 300,000 monthly users, as well as more than...
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