SSH (Secure Shell) is an encrypted protocol which allows client system to communicate securely with a server. You can connect to your system remotely, perform administrative tasks and access files. It’s more secure way to communicate with server using SSH keys than password authentication. This tutorial explains how to create SSH keys on Ubuntu 20.04 Focal Fossa.
Create SSH keys on Ubuntu#
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Before you start, make sure you are logged in as root or user with sudo privileges.
Step 1 – Create Key Pair#
At first, we will create a key pair on client system using below command:
By default, latest version of ssh-keygen will generate 3072-bit RSA key pair. If you wish to create larger 4096-bit key then pass -b 4096 in flag.
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Above command should show output like below:
Hit the Enter key to save the key pairs at ./ssh directory or you can specify location as per your choice.
Next, it will prompt to enter a secure passphrase. Passphrase will add an additional security layer to your keys. It is optional, whether you want to set or skip it by just hitting Enter key.
Next, you will see output as following:
Now you have public and private keys which you can use to authenticate with your Ubuntu server.
You also can verify that your files are generated or not by typing:
It will show output like this:
Step 2 – Copy Public Key to Server#
Next step is to place public key to your Ubuntu server. Simple and fast way to copy public is to use ssh-copy-id utility. Run the below command:
You will be prompted to enter password for your username:
Once the user is authenticate successfully, the public key will be appended to ~/.ssh/authorized_keys file on remote user and connection will be disconnected.
If your local system don’t have ssh-copy-id utility installed then you can use following command to copy the public key:
Ensure that you have password-based SSH access to your server then only you can use above method.
Step 3 – Login to the Server using SSH Keys#
Now, you should be able to login to the remote machine without the remote user’s password.
Try to connect using SSH command:
If you are first time to login then it may prompt you as following. Type yes and hit Enter key to continue:
Now, if you haven’t set passphrase for your keys then you will be logged in immediately without asking passphrase. Otherwise it will be asked to enter passphrase. After successful authentication, a new shell session will open your user account on the Ubuntu server.
Step 4 – Disable SSH Password Authentication#
You can add one more security layer by disabling the password authentication for SSH. Before starting process, make sure that you are able to authenticate to your server without entering password and must have sudo enabled user account.
Let’s login to your server using ssh:
Now edit the SSH configuration file located at /etc/ssh/sshd_config:
Find PasswordAuthentication directive and if line commented out then uncomment the line and set the value to no as given below:
Save and close the file. You must need to restart the SSH service using below command:
At this point, password-based authentication is disabled on your Ubuntu server.
Conclusion#
You learned how to create a new SSH keys pair and set up an SSH key-based authentication on Ubuntu 20.04 machine. You can set up same key to multiple remote hosts. At the end, you also learned how to disable SSH password authentication.
Generate Ssh Key 4096
By default, SSH listens on port 22. You can reduce the risk of automated attacks by changing the default SSH port.
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