The messaging app Signal is making headlines again, with the news that U.S. Defense Secretary Pete Hegseth used it for a chat with his wife, his personal lawyer and others in which he shared sensitive ...

New York (CNN) — If you hadn’t heard of Signal before Monday, chances are you have now. The secure messaging app, available for iPhones and Android devices, has long been popular with journalists ...

The recent national security breach involving a Signal group chat has raised concerns regarding the messaging app’s security. Cybersecurity experts are split on how secure the encrypted messaging ...

Investigators are using a tracking device called a "signal sniffer" that can detect signals emitted from electronic devices as the search for Nancy Guthrie continues in its third week. David Kennedy, ...

Top Trump administration national security officials’ use of the messaging app Signal is raising new questions about the platform and how the administration is transmitting sensitive government ...