1. The first thing that we need to do is create an SSH key pair to use. Creating this key pair will allow us to add the public key to GitHub. Open a terminal and enter the following command to create the SSH keypair:

1. Ubuntu 18.04 Ssh
2. Ubuntu Generate Ssh Key Pair
3. Generate Ssh Key Ubuntu

2. After entering the command, a prompt appears with a default file path confirmation. Press Enter to accept the default file path.

Oct 24, 2018  The procedure to set up secure ssh keys on Ubuntu 18.04: Create the key pair using ssh-keygen command. Copy and install the public key using ssh-copy-id command. Add yourself to sudo admin account on Ubuntu 18.04 server. Disable the password login for root account on Ubuntu 18.04. Sample set up for SSH Keys on Ubuntu 18.04.

• Jul 09, 2018  How to Add an SSH Public Key to GitHub from Ubuntu 18.04 LTS July 9, 2018 “How to Add an SSH Public Key to GitHub from an Ubuntu 18.04 LTS System” covers the entire process of creating an SSH key pair on an Ubuntu 18.04 LTS system and adding the public key to GitHub. The first thing that we need to do is create an SSH key pair to use.
• Dec 18, 2019  How to Set Up SSH Keys on Ubuntu 18.04. Secure Shell (SSH) is a cryptographic network protocol used for a secure connection between a client and a server and supports various authentication mechanisms. The two most popular mechanisms are passwords based authentication and public key based authentication.
• Apr 27, 2012  Configure SSH server to login with Keys Authentication. It is needed for it to make private key for client and public key for server. Start 'puttygen.exe' and click 'Generate' button. 3 Move mouse untill progress bar will be full. 4 Set passphrase in 'Key pass-phrase' and 'Confirm pass-phrase'. Next, Click 'Save public key' and 'Save.

3. Next, a password prompt appears. Our goal is convenience, since our public key is being created exclusively for GitHub. Leave the passphrase empty and press Enter.

4. Another prompt appears, this time asking for the passphrase confirmation. Leave this prompt blank as well and press Enter.

5. After passphrase confirmation, our SSH key pair is created and saved within the default file path that we accepted in step 2 of this tutorial. We will need to copy the entire contents of our public key to add to GitHub. To display the contents of the public key, enter the following command into the terminal:

6. The output of the previous command should display the contents of the public key like in the image below.

7. Highlight and copy the entire output of the previous command. Every part must be copied for the SSH key to work when added to GitHub.

8. Now that the public SSH key has been copied to the clipboard, open a web browser and navigate to GitHub, then log in to your account.

9. Click the account icon on the navigation bar on the top-right of the page. Select ‘Settings’ from the dropdown menu that appears.

10. Select ‘SSH and ‘GPG keys’ from the selection pane on the left of the page.

11. Click the green, ‘New SSH key’ button on the top-right of the page.

12. We are taken to the ‘Add New SSH Key’ page. First, enter an identifying title for the SSH key so discerning which computer the matching private key is on is easy.

13. Finally, paste the public SSH key that was copied in step 7 of this tutorial into the ‘Key’ text field.

14. Click the green, ‘Add SSH key’ button to finish the process.

15. Success! The new public SSH key has been added to the GitHub account and can now be used to simplify and secure your work.

Introduction

Establishing an SSH (Secure Shell) connection is essential to log in and effectively manage a remote server. Encrypted keys are a set of access credentials used to establish a secure connection.

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This guide will walk you how to generate SSH keys on Ubuntu 18.04. We will also cover setting up SSH key-based authentication to connect to a remote server without requiring a password.

• A server running Ubuntu 18.04
• A user account with sudo privileges
• Access to a terminal window / command line (Ctrl-Alt-T)

If you are already running an Ubuntu 18.04 server, you can skip this step. If you are configuring your server for the first time, you may not have SSH installed.

1. Start by installing the tasksel package:

The system will first ask for confirmation before proceeding:

2. Next, use tasksel to install the ssh-server:

3. Load the SSH server service, and set it to launch at boot:

On your client system – the one you’re using to connect to the server – you need to create a pair of key codes.

To generate a pair of SSH key codes, enter the commands:

This will create a hidden directory to store your SSH keys, and modify the permissions for that directory. The ssh-keygen command creates a 2048-bit RSA key pair.

For extra security, use RSA4096:

If you’ve already generated a key pair, this will prompt to overwrite them, and those old keys will not work anymore.

The system will ask you to create a passphrase as an added layer of security. Input a memorable passphrase, and press Enter.

This process creates two keys. One is a public key, which you can hand out to anyone – in this case, you’ll save it to the server. The other one is a private key, which you will need to keep secure. The secure private key ensures that you are the only person who can encrypt the data that is decrypted by the public key.

Step 2- Copy Public Key to the Ubuntu Server

First, get the IP address of the Ubuntu server you want to connect to.

In a terminal window, enter:

The system’s IP address is listed in the second entry:

On the client system, use the ssh-copy-id command to copy the identity information to the Ubuntu server:

Replace server_IP with the actual IP address of your server.

If this is the first time you’re connecting to the server, you may see a message that the authenticity of the host cannot be established:

Type yes and press Enter.

The system will check your client system for the id_rsa.pub key that was previously generated. Then it will prompt you to enter the password for the server user account. Type it in (the system won’t display the password), and press Enter.

The system will copy the contents of the ~/.ssh/id_rsa.pub from the client system into the ~/.ssh/authorized_keys directory of the server system.

The system should display:

If your system does not have the ssh-copy-id command, you can copy the key manually over the SSH.

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Use the following command:

To log in to a remote server, input the command:

The system should not ask for a password as it is negotiating a secure connection using the SSH keys. If you used a security passphrase, you would be prompted to enter it. After you do so, you are logged in.

Ubuntu 18.04 Ssh

If this is the first time you’ve logged into the server, you may see a message similar to the one in part two. It will ask if you are sure you want to connect – type yes and press Enter.

Step 4- Disable Password Authentication

This step creates an added layer of security. If you’re the only person logging into the server, you can disable the password. The server will only accept a login with your private key to match the stored public key.

Edit the sshd_config file:

Search the file and find the PasswordAuthentication option.

Edit the file and change the value to no:

Save the file and exit, then restart the SSH service:

Verify that SSH is still working, before ending the session:

If everything works, you can close out and resume work normally.

By following the instructions in this tutorial, you have setup SSH-key-based authentication on an Ubuntu 18.04 server.

The connection is now highly secure as it uses a set of unique, encrypted SSH keys.

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