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CentOS Stream9 ; Authenticated connection with SSH key pair

Authenticated connection with SSH key pair

Creation of public and private key pairs

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

Save the created private key id_ed25519 to an appropriate location on windows using winSCP.
Start Winscp and click "New Session"

Host name  :  Server IP Address
Port number : SSH Port
User name : Server Login User
Password : Password for the same user
「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, use su - to become root instead of a normal user.

How to connect using Tera Term
Start Tera Term, and select "File" menu "New connection"

Host : Server IP Address
TCP port : SSH Port

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
Set "Use RSA/DSA/ECDSA/ED25519 key to log in" and "Private key file:" to "id_ed25519" saved in Windows earlier, and click "OK"

Creating a private key using PuTTYgen

Start Winscp and launch Run Puttygen from "Tools".

Click Load

The Open File dialog box will open. 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 "OK"

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
In the "Use RSA/DSA/ECDSA/…" field, specify "id_ed25519.ppk" saved in windows.

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