That Flatpak package, linked above in this thread, is unofficial.
Our official download instructions for Linux tell people how to install our APT key, and every release is signed.
I'm assuming Brian Krebs' original is referring to macOS. Our releases are signed on macOS and Windows too.
💐
@Mer__edith Why not take ownership of the Flatpak then? Only Debian-based distributions use apt, but Flatpak works on damn near everything.
@x_cli @briankrebs