If you have a PKI certificate in your Windows PC that you would like to use to log in to your OpenSSH-enabled Linux server, it can be a pain to figure out how to extract the public key from this file and convert it into a format OpenSSH can understand.
It’s no longer good enough to just use a witty password for your publicly exposed OpenSSH server! As brute-force systems become more advanced and password cracking times decrease, your server becomes more at risk. A well-known secure solution to this issue is to use Public Key Authentication. This tech tutorial walks you through securing your public OpenSSH SSH Linux servers with unbreakable WWPass PassKey Two-Factor Authentication