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Rocky Linux9.3 ; SSH connection with public key

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 : Server Login User
Password : Password for the same user
Click "Save"

Site name : Any name
Click "OK

After confirming the server, click "Login".

Click "Update" when the following screen appears

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.

Editing SSH Configuration File

Edit the SSH configuration file to disable password authentication.
This time, instead of being an ordinary user, 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  Check "Replace...." and click "Continue".

User name : Login User Name
Password : Password specified in the creation of a public/private key pair
Under "Use RSA/DSA/ECDSA/ED25519 key to log in", set "Private key file:" to "id_ed25519" that you just saved in Windows. and click "OK".

Creating a private key using PuTTYgen

Start Winscp and launch [Run Puttygen] from [Tools].

Select the appropriate server

Click Load

The [ Open File Dialog ] will open, change the file type to [ All Files (*. Change the file type to [ All Files (*. *) ] and load the private key id_ed25519 that was 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"

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Click on "Login"

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

When connecting with Tera Term, use the following
Use RSA/DSA/ECDSA/..." Specify "id_ed25519.ppk" saved in windows in the "Use RSA/DSA/ECDSA/..." field.

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