There are several ways of logging into a server over SSH. Methods include password login, key-based login and two-factor authentication.
Two-factor authentication is a much better type of protection. In the event that your computer gets compromised, the attacker would still need an access code to login.
In this tutorial, you will learn how to set up two-factor authentication on Debian 9 using Google Authenticator and SSH.

A couple years back we wrote a guide on how to create good OpenPGP/GnuPG keys and now it is time to write a guide on SSH keys for much of the same reasons: SSH key algorithms have evolved in past years and the keys generated by the default OpenSSH settings a few years ago are no longer considered state-of-the-art. This guide is intended both for those completely new to SSH and to those who have already been using it for years and who want to make sure they are following the latest best practices.

Copyright is automatic (since the Berne convention) and any work of authorship is automatically protected by it – essentially giving the copyright holder1 exclusive power over its work. In order for your downstream to have the rights to use any of your work – be that code, text, images or other media – you need to give them a license to it.

Configure which identity-file to use host-wide without further arguments

The story of the Unix C compiler, and the virtually invisible back-door security hole inserted into it by Ken Thompson - a story he told in his Turing award lecture..

The only annoyance was that Thunderbird only ever synced my main Inbox folder, not all subfolders. So I had to go through them manually to check for new email.