Store your authentication keys securily on your Yubikey. Use gpg-agent to ssh to your servers.
Configuring multiple keys
Couple a physical token to your password to enhance your security.
Is your password strong enough ? How can you improve your security ?
You have lost your GPG keys and you need to restore your backups. I list the ways to do this.
You GPG keys are precious, this posts shows how you can back them up securely.
GnuPG is a complete and free implementation of the OpenPGP standard which lets you send and receive encrypted emails, amongst other things.
An air gap is a network security measure to ensure that a computer network is physically isolated from unsecured networks.
fail2ban is a program protecting your server from brute force attack. When fail2ban detects a possible attack attempt, the source ip is banned.
In this guide, we’ll demonstrate how to password protect assets on an Apache web server running on Ubuntu 14.04.