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Fedora37 ; Remote connection with SSH public key cryptography

1.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 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 number
User name : General username
Password :  General username Password

Site name : Any connection name
Click "OK"

After confirming the server, click "Login".

Click "Update" when the following screen appears

In the following screen, enter the user's password in the "Pasword" 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.

2.Editing SSH Configuration File

Edit the SSH configuration file to disable password authentication.

How to connect with 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
Under "Use RSA/DSA/ECDSA/ED25519 key to log in", set "Private key file:" to "id_ed25519" that you just saved in Windows.
Set "id_ed25519" that you just saved in Windows to "Private key file:" and click "OK".

3.Creating a private key using PuTTYgen

Start Winscp, select the appropriate server, and launch Run PuTTYgen from Tools.
Select the appropriate server

Click "Load"

[ Open File Dialog ], 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.

Enter the passphrase you entered when you created the private key on the server side

Click the [ Save private key ] button to save the private key.

Here we save it as id_ed25519.ppk (in Windows).

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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