Seriously Risky Business Newsletter
May 08, 2025
It's Like Signal, but Dumb
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Policy & Intelligence
The use of encrypted messaging apps by senior Trump officials has become a rolling security disaster. We've now learned that rather than using actual Signal, they've been using a bastardised version that undermines the app's security guarantees.
Last week, President Trump's then-national security advisor Mike Waltz was photographed surreptitiously checking his phone for messages during a cabinet meeting. It gave a decent view of exactly what was on Waltz' screen. Rather than the official Signal app, he appeared to be using something called TM SGNL to communicate with Secretary of State Marco Rubio, Vice President JD Vance, Director of National Intelligence Tulsi Gabbard and special envoy Mike Wiktoff.
It turns out TM SGNL is a forked version of Signal maintained by a company called TeleMessage. The company makes clones of popular consumer messaging apps with the addition of archiving functions to store messages.