How do I enable SSH key-based authentication in Ubuntu?

Table of Contents

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.

How do I authenticate my SSH key?

If the client can prove that it owns the private key, a shell session is spawned or the requested command is executed.

Step 1 — Creating SSH Keys.
Step 2 — Copying an SSH Public Key to Your Server.
Step 3 — Authenticating to Your Server Using SSH Keys.
Step 4 — Disabling Password Authentication on your Server.

How do I generate a SSH key in github?

Login to github.com and bring up your account settings by clicking the tools icon. Select SSH Keys from the side menu, then click the Add SSH key button. Name your key something whatever you like, and paste the contents of your clipboard into the Key text box. Finally, hit Add key to save.

How do I create a SSH folder on Raspberry Pi?

Setting up SSH Keys on the Raspberry Pi

Step 1 : Create SSH Directory & authorized_keys File [A]
Step 2 : Set Permissions [A]
Step 3 : Creating A New Key Pair [A]
Step 4 : Copy Key Files to your local machine.
Step 5 : Adding an Existing Key [A]
Step 6 : Configure SSH Client [B]
Step 7 : Connect [B]

How do I configure SSH key-based authentication on a Linux server?

Procedure

Use the ssh-keygen tool to create a key pair.
Validate that the keys were generated.
Enable key-based authentication in the /etc/ssh directory on the SSH server.
Copy the rsa.
If you have an existing authorized_keys file, edit it to remove any no-pty restrictions.

How do I SSH into Ubuntu?

Enabling SSH on Ubuntu

Open the terminal with Ctrl+Alt+T and install the openssh-server package: sudo apt update sudo apt install openssh-server.
Once the installation is complete, the SSH service will start automatically.
Ubuntu ships with a firewall configuration tool called UFW.

What is SSH key-based authentication?

An SSH key is a secure access credential used in the Secure Shell (SSH) protocol. SSH keys use key pairs based on public key infrastructure (PKI) technology, the gold standard for digital identity authentication and encryption, to provide a secure and scalable method of authentication.