Auto Login to Ubunutu machine from windows using putty



1. Login to ubuntu machine
2. ssh-keygen -t rsa ( dont enter any passphrase)
  public and private key would be generated in ~/.ssh.  id_rsa and id_rsa.pub.

3. Copy  id_rsa.pub to ~/.ssh/authorized_keys

4. Uncomment the line Authorized_key in /etc/ssh/sshd_config

5. service ssh restart

4. Copy id_rsa to windows machine

5. Download putty-keygen 

6. Load the copied id_rsa into putty-keygen and save as private key

7. Open putty and load the private key.