SSH login using RSA key

Would you like to learn how to configure OpenSSH to allow SSH login using RSA keys? In this tutorial, we are going to show you all the steps required to configure the OpenSSH service ao allow SSH login using RSA keys on Ubuntu Linux.

• Ubuntu 18.04
• Ubuntu 19.10
• Ubuntu 20.04

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Tutorial Ubuntu Client – SSH login using RSA key

• IP – 192.168.100.9
• Hostname – UBUNTUCLIENT

Install the required packages on the client computer.

Create a user account.

Here is the command output.

Login the system using the user account.

Create an RSA key.

Optionally, enter a password to protect the key.

Here is the command output.

Verify the content of the user’s hidden directory named SSH.

Here is the command output.

The file named ID_RSA contains the user’s private key.

The other file contains the user’s public key.

You have finished the client-side required configuration.

Tutorial Ubuntu Server – SSH login using RSA key

• IP – 192.168.100.10
• Hostname – UBUNTUSERVER

Install the required packages on the server computer.

Create a user account.

Here is the command output.

Login the system using the user account.

Create a hidden directory named SSH inside the user HOME directory.

Access the SSH hidden directory and create a file named AUTHORIZED_KEYS.

Insert the content of the public key generated on the client computer into this file.

Here is the file content.

You have finished the server-side required configuration.

Testing the SSH login using RSA key

On the client computer, start an SSH connection to the remote server.

If required, enter the Key password.

After a successful login, the remote access will be authorized.

Congratulations! You did setup the SSH authentication using RSA keys.