Unixcop published a guide showing you how to hardening the SSH configuration.

Hardening SSH Configuration

This post is about Hardening SSH Configuration Introduction SSH has become the standard tool for remote management of UNIX-based systems. The SSH daemon (sshd) is installed on almost all of the major systems by default. Additionally, sshd also provides a lot of configuration options for us.

Hardening SSH Configuration - Unix / Linux the admins Tutorials