Secure messaging on Windows with Signal

Almost two years ago, this was how I explained why you might want to use Signal:

Sometimes you need to send a message that you can be certain will stay private. Perhaps a friend urgently needs a place to stay while you’re out of town, and you must give them your alarm code (and maybe tell the neighbor who has your spare key how to recognize them). Or perhaps you want to discuss a medical condition, or something that’s perfectly legal but might still get you into trouble at work, such as whistleblowing or staging a protest.