CentOS Server Hardening Tips

This article provides various hardening tips for your Linux server.
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CentOS Use Public/Private Keys for Authentication

The following Tutorial walks you through how to setup authentication using a key pair to negotiate the connection, stopping the requirement for passwords.
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Use Google Authenticator for SSH

I have recently setup two factor authentication on my server using Google Authenticator, I thought it would be a good idea to share with you guys the way I achieved this and some issues I bumped into along the way.
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