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CentOS7.9 ; SSH connection with public-key

SSH connection with authentication using RSA public key cryptography

 Create 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.
This time, we will create a key set using the RSA cipher used in the SSH protocol Version 2.
Creation of public/private key pairs is performed with remote login user privileges (huong).
If you do not specify the destination and file name, id_rsa and will be created in /home/huong/.ssh/. On the way, enter the password for the key.

Using Winscp or similar, save the private key (~/.ssh/id_rsa) in an appropriate location on Windows.
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

Site name : Any name

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.
Drag and drop "id.rsa" under /home/huong/.ssh on the server side to the left column Windows and save it.

Edit 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 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
Check the "Use RSA/DSA…." checkbox. and in the "Private key file" field, specify the "id_rsa" that you just saved in windows.

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 (*. *)] and load the private key id_rsa transferred from the Linux server.

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

Click on "Sve private key"

Save the private key file to windows, file name is "id_rsa.ppk"

Select the appropriate server and click "Edit"

Click on "Advanced"

Select "Authentication" and specify the "id_rsa.ppk" file saved by windows in the "Private key file" field.

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 the following
Use RSA/DSA/ECDSA/…" Specify "id_rsa.ppk" saved in windows in the "Use RSA/DSA/ECDSA/…" field.


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