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MiracleLinux9 : SSH Authenticated connection with key pair

SSH connection with authentication using public key cryptography

Creation of public and private key pairs

Create a public/private key pair for a user connecting to the Linux server using OpenSSH.
Use ssh-keygen to create key pairs.
Creation of public/private key pairs is performed with remote login user privileges.
If you do not specify the destination and file name, id_ed25519 and will be created in /home/(user name)/.ssh/. On the way, enter the password for the key.

Save the created private key id_ed25519 to an appropriate location on windows using winSCP.
Start Winscp
Host name : Server IP address
Port number : SSH port number
User name : User name
Password :  User password
click "Save".

Site name : Any name
Click "OK"

After confirming the server, click "Login".

When the following screen appears, click "Update.

Password of the logged-in user in the Password field

When connected, the right column is the server side and the left column is the PC (Windows) side.
Save the file "id_ed25519" in the .ssh directory to an appropriate location on Windows in the left column.

Edit SSH configuration file

Edit the SSH configuration file to disable password authentication.
su - to become root.

How to connect with Tera Term

Start Tera Term, and select "File" menu "New connection"

Host : Server IP Address
TCP port : SSH port number

If you get the following security warning "Replace.... and click "Continue".

User name : Login User Name
Password : Password specified in the creation of a public/private key pair
Use RSA/DSA/ECDSA/ED25519 key to log in /Private key file  :  Set "id_ed25519" saved in Windows
Click "OK"

Creating a private key using PuTTYgen

Launch Winscp and start [Run PuTTYgen] from Tools

Select the appropriate server

Click "Load"

Click Load to open the Open File dialog box, change the file type to [ All Files (*. Change the file type to [ All Files (*. *) ] and load the private key id_ed25519 transferred from the Linux server.

The password is the password set in "Creating a public and private key pair" above

Click on "Save private key"

Save the file with the extension ".ppk" in the same place as "id_ed25519" saved earlier on the Windows side under the name "id_ed25519.ppk".

Select the appropriate server and click "Edit"

Click on "Advanced"

Open the "Authentication" menu and specify "id_ed25519.ppk" saved in Windows for "Private key file".

Click "Save"

Click on "Login"

The password is the password set in "Creating a public and private key pair" above

When connecting with Tera Term
"Use RSA/DSA/ECDSA/..." field :   Specify "id_ed25519.ppk" saved in windows