Keys Authentication2008/11/26

	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]	Login as a user you'd like to configure for Keys Authentication.

[fedora@ns ~]$

ssh-keygen -t rsa

Generating public/private rsa key pair.
Enter file in which to save the key (/home/fedora/.ssh/id_rsa):
Created directory '/home/fedora/.ssh'.
Enter passphrase (empty for no passphrase):

# set any password

Enter same passphrase again:

# verify

Your identification has been saved in /home/fedora/.ssh/id_rsa.
Your public key has been saved in /home/fedora/.ssh/id_rsa.pub.
The key fingerprint is:
xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx fedora@ns.srv.world
[fedora@ns ~]$

cd .ssh

[fedora@ns .ssh]$

mv id_rsa.pub authorized_keys

[fedora@ns .ssh]$

chmod 600 authorized_keys

[fedora@ns .ssh]$

cat id_rsa

# Copy all in this file like below and Paste into a file on Windows client computer.

-----BEGIN RSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
*******************************
*******************************
-----END RSA PRIVATE KEY-----

[fedora@ns .ssh]$

rm -f id_rsa

[fedora@ns .ssh]$

su -

Password:
[root@ns ~]#

vi /etc/ssh/sshd_config

# line 64: change

PasswordAuthentication

[root@ns ~]#

/etc/rc.d/init.d/sshd restart

Stopping sshd:

[ OK ]

Starting sshd:

[ OK ]

[2]	Download PuTTYgen and start it on Windows client computer. And next, Click [File]-[Load private key] like below. Then, Choose a file which is private key that you made in section [1].
[3]	Click 'Load' button and load private key you made.

[4]	You need to answer with passphrase for private key which you set in section [1].

[5]	The message below is shown.

[6]	Click the button 'Save private key' and Save it in any place you like on your computer.

[7]	Start putty and move to 'Auth' section like below. next, Select the private key you saved in previous section.

[8]	Back to the 'Session' section and input server's IP address to login.

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