##Installation
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Install the RPM
rpm -ivh http://migrantgeek-yum.s3.amazonaws.com/rhel/6/noarch/yubikey-ssh-0.1-1.noarch.rpm
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Add your API key to /etc/yubikey.conf
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Add following line to SSH and restart
echo "ForceCommand /usr/sbin/yubikey-ssh.py" >> /etc/ssh/sshd_config service sshd restart