[codedokode]

This is not secure at all because you just gave Signal root access to your system. By adding their keys you also have granted a permission for Signal to replace any packages on your system.

I would instead manually download and unpack the app, create separate user for it, and run it in chroot. Much safer than your method.

[electromech]

Respectfully, I don't think that's correct, or possibly I am misreading your comment. IIUC, placing a key in /usr/share/keyrings does not allow those keys to sign any package, only the packages designated with "signed-by" in the apt list.

Sadly, plenty of applications still take the old "apt-key" approach of adding the keys globally (e.g., installing keys to /etc/apt/trusted.gpg.d), but I think Signal's installation process is the correct/recommended approach for distributing apt packages securely.

[codedokode]

Yes, I made a mistake about the key. Adding a key is safe by itself. However by adding third-party repository you are granting Signal a permission to replace packages on your system (unless you manually whitelist package names in apt preferences), and by installing a package from Signal repository you grant it root access to your system.

Sadly debian-based distributions do not respect the principle of least privileges and grant unnecessary permissions to installation scripts.