A journalist’s inclusion in a national security discussion served as a reminder that you might not know every number in the chat — and that could be a big problem.

The White House on Wednesday continued to downplay and deflect criticism over a Signal group chat among top Trump ...

The encrypted messaging app Signal has been thrust into the news cycle thanks to accidental addition of the editor-in-chief ...

The White House continued to downplay the seriousness of the incident, parsing semantics and attacking the journalist who was ...

making it a versatile app for talking on a secure channel with others. Up to 1,000 people can join a group chat, and messages can be set to disappear after a period of time. Signal has been ...

The app has no ads, does not track users' data, and does not store any metadata such as timestamps, internet addresses or ...

Given the first day of the Houthi campaign went off without a hitch, national security adviser Mike Waltz’s errant invite ...

Top national security officials for President Donald Trump, including his defense secretary, texted war plans for upcoming ...