Ubuntu 10.04
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Keys Authentication
2010/07/18
  Configure SSH server to login with Keys Authentication. It is needed for it to make private key for client and public key for server.

[1] Download 'puttygen.exe' from Putty's site.

[2] Run 'puttygen.exe' and click 'Generate' button.
 
[3] Move mouse untill progress bar will be full.
 
[4] Set passphrase in 'Key passphrase' and 'Confirm passphrase'. Next, Click 'Save public key' and 'Save private key' and Save keys with a file name you want.
 
[5] Open 'public_key' you saved.
 
  Remove first line and last line and replace second line to 'ssh-rsa' and then remove all indention like follows.
'ssh-rsa xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx=='
 
[6] Login with a user and put 'public_key'.
lucid@ubuntu:~$
mkdir .ssh

lucid@ubuntu:~$
chmod 700 .ssh

lucid@ubuntu:~$
cd .ssh

lucid@ubuntu:~/.ssh$
vi authorized_keys


# Copy and Paste 'public_key'

ssh-rsa xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx==


lucid@ubuntu:~/.ssh$
chmod 600 authorized_keys

lucid@ubuntu:~/.ssh$
su -

Password:
root@ubuntu:~#
vi /etc/ssh/sshd_config


# line 50: uncomment and change

PasswordAuthentication
no


root@ubuntu:~#
/etc/init.d/ssh restart

* Restarting OpenBSD Secure Shell server sshd
[ OK ]

[7] Run Putty and select 'private_key' like follows.
 
[8] All OK, connect to the server with keys authentication.
 
[9] Passphrase you set is required to input fpr login. After inputiing correct one, it's possible to login like below.
 
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