An extraordinary breach of U.S. security is stunning security and intelligence veterans, after a journalist was added to a Trump administration group chat on Signal, where senior leaders discussed ...

Signal, the most secure widely available messaging app, has become a go-to resource for journalists, leakers and other people concerned about privacy. But it’s not infallible. And its shortcomings and ...

Several days after top national security officials accidentally included a reporter in a Signal chat about bombing Houthi sites in Yemen, a Pentagon-wide advisory warned against using the messaging ...

Last month, after news broke that Secretary of Defense Pete Hegseth was using Signal to discuss sensitive military operations in violation of Pentagon policy, one of his closest military aides made an ...

The company behind the Signal clone used by at least one Trump administration official was breached earlier this month. The hacker says they got in thanks to a basic misconfiguration. Only he wasn’t ...