Elon Musk's team working to dismantle the federal bureaucracy and the protesters hoping to stop him have something in common. They use Signal to keep their communications secure. Signal, a text-and-voice app that is a little over a decade old, is seen as the gold standard for end-to-end encrypted communications, according to mobile security experts. It has been widely adopted - not just by privacy-conscious dissidents but by officials, lawmakers, generals, and corporate leaders as well. Even