SSH Keys

Configuring your SSH client to use keys instead of password

Putty

Generate a public/private key pair on your by using PuTTYgen as illustrated below:

Start PuTTYgen

You will be asked to move mouse to generate some randomness. After that the program will generate key and display the result.

Boxes "Key passphrase" and "Confirm passphrase" leave blank to be able to authenticate without passphrase.
Now, you can save public and private key.
You can recover the public key from the private key with PuTTYgen by clicking the Load button. But uou can not recover the private key from the public key.

SSH Secure Shell

Install the public key on the remote host