Authentification
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Yubikey
Please read and make yourself familiar with OTP and the concept or Two Factor Authentification.
Personalisation Tool
You can use a ppa to install the required software in Ubuntu:
* https://launchpad.net/~yubico/+archive/ubuntu/stable * https://www.yubico.com/products/services-software/personalization-tools/use/ sudo apt-get install yubikey-personalization yubikey-neo-manager yubioath-desktop ykneomgr
SSH
Generally: only use key based authentification with your ssh-webserver login!
vim /etc/ssh/sshd_config
[...] PermitRootLogin without-password StrictModes yes RSAAuthentication yes PubkeyAuthentication yes IgnoreRhosts yes RhostsRSAAuthentication no HostbasedAuthentication no PermitEmptyPasswords no ChallengeResponseAuthentication no PasswordAuthentication no # <<<< !!!! X11Forwarding no UseLogin no UsePAM no <<<< !!!!