Keys Authentication2013/05/06

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]	Start 'puttygen.exe' and click 'Generate' button.

[3]	Move mouse untill progress bar will be full.

[4]	Set passphrase in 'Key pass-phrase' and 'Confirm pass-phrase'. 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'.

wheezy@dlp:~$

mkdir .ssh

wheezy@dlp:~$

chmod 700 .ssh

wheezy@dlp:~$

cd .ssh

wheezy@dlp:~/.ssh$

vi authorized_keys

# Copy and Paste 'public_key'

ssh-rsa xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx==

wheezy@dlp:~/.ssh$

chmod 600 authorized_keys

wheezy@dlp:~/.ssh$

su -

Password:

root@dlp:~#

vi /etc/ssh/sshd_config

# line 51: uncomment and change to 'no'

PasswordAuthentication

root@dlp:~#

/etc/init.d/ssh restart

[ ok ] Restarting OpenBSD Secure Shell server: sshd.

[7]	Start Putty and select 'private_key' like follows.

[8]	If All OK, connect to the server with keys authentication.

[9]	Pass-phrase you set is required to input fpr login. After inputiing correct one, it's possible to login like below.

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