CentOS 7
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OpenSSH : SSH Key-Pair Authentication2014/07/29

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 on SSH Server Host and work like follows.
# create key pair

[cent@dlp ~]$
ssh-keygen -t rsa

Generating public/private rsa key pair.
Enter file in which to save the key (/home/cent/.ssh/id_rsa):  
# Enter if keep default

Created directory '/home/cent/.ssh'.
Enter passphrase (empty for no passphrase):  
# set passphrase (set no passphrase to Enter with empty)

Enter same passphrase again:
Your identification has been saved in /home/cent/.ssh/id_rsa.
Your public key has been saved in /home/cent/.ssh/id_rsa.pub.
The key fingerprint is:
38:f1:b4:6d:d3:0e:59:c8:fa:1d:1d:48:86:f0:fe:74 cent@dlp.srv.world
The key's randomart image is:

[cent@dlp ~]$
mv ~/.ssh/id_rsa.pub ~/.ssh/authorized_keys

[2] Transfer the secret key created on the Server to a Client, then it's possible to login with keys authentication.
[cent@www ~]$
mkdir ~/.ssh

[cent@www ~]$
chmod 700 ~/.ssh
# copy the secret key to local ssh directory

[cent@www ~]$
scp cent@ ~/.ssh/

cent@'s password:
[cent@www ~]$
ssh -i ~/.ssh/id_rsa cent@

Enter passphrase for key '/home/cent/.ssh/id_rsa':  
# passphrase

Last login: Wed Jul 30 21:37:19 2014 from www.srv.world
[cent@dlp ~]$  
# just logined

[3] If you set [PasswordAuthentication no], it's more secure.
[root@dlp ~]#
vi /etc/ssh/sshd_config
# line 65: turn to [no]

# line 69: make sure the value is [no]

ChallengeResponseAuthentication no
# line 96: make sure the value is [yes]

UsePAM yes
[root@dlp ~]#
systemctl restart sshd

SSH Key-Pair Authentication 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 login, then answer it. If it's correct, it's possible to login normally like follows.
SSH Key-Pair Authentication from Windows Client #2
[10] If your Windows is Windows 10 Version 1803 like here, OpenSSH Client has been implemented as a Windows feature, so it's possible to authenticate with SSH Key-Pair without Putty and others. Transfer the secret key to your Windows 10 and put it uder the [(logon user home).ssh] folder like follows, then it's ready to use Key-Pair login.
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