This How-To will walk you through setting up public key authentication over SSH. Using key-based authentication instead of passwords means you don't have to give away system passwords. There are several benefits for doing this. For example, it can be used to automate authentication, or to enhance security by requiring a user-generated key in addition to a passphrase. Key-based authentication also simplifies the distribution and management of login credentials across several remote systems.
In this How-To we're going to walk you though changing the default SSH port on a Linux system.