Besides auto login into ssh with putty by specify password on the command line as we have done in this post, the tutorial uses the private/public key method to do the auto login.

Setup on the local computer

1. We need putty.exe and puttygen.exe, all can be downloaded here: http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html
2. Run puttygen.exeto generate the private/public key pairs:
   Make sure you select the SSH-2 version key in the bottom, you can also choose from RSA or DSA
3. Save the private key on your local computer, find a folder which is safe, keep in mind that if you leak this private key to public, someone else will also be able to login to your server.
4. Open putty.exe, go to Connection->SSH->Auth, load the private key:
5. Go to Session, create a session with the name “remote_server”:

Setup on the server side

1. Copy the content of the public key you generated in puttygen.exe
2. Putty into the server as you do normally, create a file: ~/.ssh/authorized_keys, if the folder .ssh not already exist, create it.
3. Paste the content you copied from step 1 into the file and save exit.

Now, open putty.exe, double click on the “remote_server” session, you will be able to login to the server without password, but it will prompt you to type in the user name. To fully automate the login process, let’s create a shortcut to the putty.exe on your desktop:
C:\putty.exe -l username -load "remote_server"