1. Installing GPG

To set up your Debian 12 system to download the Key9 SSH client software from the Key9 repository, you need to follow these steps.

First, you should install "gpg" (GNU Privacy Guard), which is an open source version of PGP (Pretty Good Privacy). Key9 uses "gpg" to sign our Debian releases, ensuring that you receive signed, secure releases of our software.

This will not only allow you to easily install the Key9 SSH software, but also keep your systems patched and up to date.

To install “gpg”, as “root”, execute the following commands:

apt-get install gpg