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SSH stands for “Secure Shell” and is an encrypted protocol used to log in and manage a remote server. SSH also supports various authentication mechanisms. SSH uses password-based authentication and public key-based authentication for a secure connection between a client and a server. SSH key-based authentication is more secure than password-based authentication because keys are very hard to guess or crack using currently available computing power.

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In this tutorial, we will show you how to set up SSH key-based authentication on an Ubuntu 18.04 server.

Apr 12, 2018 SSH-key-based authentication provides a more secure alternative to password-based authentication. In this tutorial we'll learn how to set up SSH key-based authentication on an Ubuntu 16.04 installation. To create a new key pair, select the type of key to generate from the bottom of the screen (using SSH-2 RSA with 2048 bit key size is good for most people; another good well-known alternative is ECDSA). Then click Generate, and start moving the mouse within the Window. Putty uses mouse movements to. I am not sure if your private key will work in ubuntu, but its worth a shot. Just copy the keys to /home/yourName/.ssh/ name the private key as idrsa, and the public key as idrsa.pub. If that is not working, then you can create you own ssh key-pair using ssh-keygen and copy the new public key to the server, and ssh as follows. Jun 06, 2018  Generating SSH keys on Ubuntu 16.04. To generate the SSH key pair, simply run the following command from the terminal on your local Ubuntu 16.04 based computer: ssh-keygen. You can just press Enter to leave the default values to all the questions. Optionally, you can also set a passphrase to add an extra layer of security, or just press Enter.

Prerequisites

• Two fresh Ubuntu 18.04 VPS on the Atlantic.Net Cloud Platform.
• Root passwords configured on both servers.

Step 1 – Create an Atlantic.Net Cloud Server

First, log in to your Atlantic.Net Cloud Server. Create a new server, choosing Ubuntu 18.04 as the operating system with at least 2GB RAM. Connect to your Cloud Server via SSH and log in using the credentials highlighted at the top of the page.

Once you are logged into your Ubuntu 18.04 server, run the following command to update your base system with the latest available packages.

Step 2 – Generate the SSH Key on the Client Machine

First, log in to your client machine and generate a new SSH key pair by running the following command:

Go to the Properties Enter the Product key at Windows Activation part at the end of the screen.Note: Make sure you are connected to the Internet because it will check online that either the product key you are trying to insert is valid or not. Windows 10 ultimate key generator free download. Furthermore, restart your PC and get all. How to find Windows 10 Product KeyWhen you, you may require entering the item key Windows 10. Right-click on This PC.

You will need to press Enter to accept the default file location and provide a passphrase to add an extra layer of security, as shown below:

The above command will generate a 2048-bit RSA key pair with a secure passphrase to prevent unauthorized users from logging in.

You can see the generated public and private keys with the following command:

You should see the following output:

At this point, you have public and private keys that you can use to authenticate with your Ubuntu server.

Step 3 – Copy the Public Key to the Ubuntu Server

Next, you will need to copy the public key from the client machine to your Ubuntu 18.04 server. You can copy the public key with ssh-copy-id utility as shown below:

You should see the following output:

Type “yes” and press ENTER to continue. You should see the following output:

Next, you will be prompted to enter the remote username and password. After the successful authentication, the content of the public key ~/.ssh/id_rsa.pub will be appended to the remote user ~/.ssh/authorized_keys file as shown below:

Step 4 – Disable SSH Password Authentication

Next, log in to your Ubuntu 18.04 server machine and disable SSH password-based authentication to add an extra layer of security to your server.

You can disable password-based authentication by editing the file /etc/ssh/sshd_config:

Find the following lines and change the value to “no”:

Save and close the file, then restart SSH service to apply the configuration:

Step 5 – Log in to the Server using SSH Keys

At this point, SSH key-based authentication is configured. Now it’s time to log in to the Ubuntu 18.04 server machine with the public key.

You can login to your Ubuntu 18.04 server by simply running the following command:

If you are logging in for the first time, you will be prompted as shown below:

Type Yes and hit Enter key to continue. Next, you will be prompted to enter the passphrase for your private key as shown below:

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Provide your private key passphrase and hit Enter to log in to your server.

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Conclusion

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In the above tutorial, we learned how to set up an SSH key-based authentication with a passphrase on Ubuntu 18.04. The connection between your client machine and Ubuntu 18.04 server machine is now highly secure. You can also use the same key for another remote server. If you’re ready to get started with SSH key-based authentication, try VPS hosting with Atlantic.Net today.