"The app’s security is viewed as fairly strong due to its robust privacy features and minimal data collection, as well as default end-to-end encryption of all messages and voice calls. The app also includes a function that deletes all messages from a conversation within a set time frame, adding an additional layer of data protection. But experts agree that it shouldn’t be used by government officials as an alternative to communicating through more secure, sanctioned government communications — which Signal is not.
“It’s so unbelievable,” a former White House official, granted anonymity to discuss The Atlantic’s report candidly, said Monday. “These guys all have traveling security details to set up secure comms for them, wherever they are.”
The former White House official pointed out that members of Trump’s Cabinet — including the vice president, Defense Secretary Pete Hegseth, and Director of National Intelligence Tulsi Gabbard, among others — were likely using personal devices, since in most cases, Signal cannot be downloaded onto official federal devices. This alone creates a host of cybersecurity issues."
https://www.politico.com/news/2025/03/25/signal-cybersecurity-trump-war-planning-00246881