HOwto Setup SSH server to use keys for authentication

good idea, more secure, less chance of someone guessing or brute forcing your password.

Setup the SSH server to use keys for authentication

SSH server can be set up in various ways, but in this document I’ll describe how it can be configured to:

* only support connections through the 2nd version of the SSH protocol (SSH-2)
* use 2048-bit DSA keys for user authentication, without permitting authentication with passwords
* allow only a specific group of users to connect