SSH Key-Pair Authentication2017/07/17

	Configure SSH server to login with Key-Pair Authentication. Create a private key for client and a public key for server to do it.
[1]	Create Key-Pair for each user, so login with a common user and work it like follows.

[fedora@dlp ~]$

ssh-keygen -t ecdsa

Generating public/private ecdsa key pair.
Enter file in which to save the key (/home/fedora/.ssh/id_ecdsa):

# Enter with default

Created directory '/home/fedora/.ssh'.
Enter passphrase (empty for no passphrase):

# set passphrase (if set no passphrase, Enter with empty)

Enter same passphrase again:
Your identification has been saved in /home/fedora/.ssh/id_ecdsa.
Your public key has been saved in /home/fedora/.ssh/id_ecdsa.pub.
The key fingerprint is:
SHA256:b4ZG1OZEtWEpxeAVLgRkTlK4tfysA5Y7hkYN14NZ2ZM fedora@localhost.localdomain
The key's randomart image is:

[fedora@dlp ~]$

mv ~/.ssh/id_ecdsa.pub ~/.ssh/authorized_keys

[fedora@dlp ~]$

chmod 600 ~/.ssh/authorized_keys

[2]	Transfer the secret key created on the Server to a Client, then it's possbile to login with keys authentication.

[fedora@www ~]$

mkdir ~/.ssh

[fedora@www ~]$

chmod 700 ~/.ssh

# copy the secret key to local ssh directory

[fedora@www ~]$

scp fedora@10.0.0.30:/home/fedora/.ssh/id_ecdsa ~/.ssh/

fedora@10.0.0.30's password:

[fedora@www ~]$

ssh fedora@10.0.0.30

Enter passphrase for key '/home/fedora/.ssh/id_ecdsa':

# passphrase

Last login: Wed Dec 10 22:23:46 2014 from www.srv.world
[fedora@dlp ~]$

# just logined

[3]	If you set "PasswordAuthentication" no, it's more secure.

[root@dlp ~]#

vi /etc/ssh/sshd_config

# line 65: change to no

PasswordAuthentication

[root@dlp ~]#

systemctl restart sshd

SSH Key-Pair Auth from Windows Client

	It's the example to login to SSH server from Windows Client. It uses Putty on here. Transfer a secret key to Windows Client first.
[4]	Download [Puttygen.exe] from Putty Site and save it under the Putty directory. Next execute it and click [Load] button.

[5]	Specify the secret key which you downloaded, then passphrase is required like follows, answer it.

[6]	Click [Save private key] button to save it under a folder you like with any file name you like.

[7]	Start Putty and open [Connection] - [SSH] - [Auth] on the left menu, then select the [private_key] which was just saved above.

[8]	Back to the [Session] on the left menu and connect to the SSH server.

[9]	The passphrase is required to input, then answer it. If it's correct passphrase, it's possible to login normally like follows.

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