A Pentagon-wide advisory that went out one week ago warned against using Signal, the messaging app, even for unclassified information. Several days after top national security officials accidentally ...

The encrypted messaging app Signal is receiving renewed attention after high-level members of President Donald Trump's administration inadvertently added a journalist to a group chat discussing ...

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A screengrab of a page from a Pentagon-wide memo warning against using the messaging app Signal. Several days after top national security officials accidentally included a reporter in a Signal chat ...