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

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

How to configure SSH Public key-based authentication for a Linux/Unix

1. On your local system type: ssh-keygen.
2. Install public key into remote server: ssh-copy-id user@remote-server-ip-name.
3. Use ssh for password less login: ssh user@remote-server-ip-name.

What is the purpose of SSH keys?

Secure Socket Shell (SSH) Key Management, also called Secure Shell Management, is a special network protocol leveraging public-key cryptography to enable authorized users to remotely access a computer or other device via access credentials called SSH keys.

How do I enable SSH keys?

How to set up SSH keys

1. Create the ssh key pair using ssh-keygen command.
2. Copy and install the public ssh key using ssh-copy-id command on a Linux or Unix server.
3. Add yourself to sudo or wheel group admin account.
4. Disable the password login for root account.

Where are SSH keys saved?

Enter file in which to save the key (/home/username/. ssh/id_rsa): Press enter to save your keys to the default /home/username/. ssh directory.

How does a client know which SSH key to use?

When a client connects to the host, wishing to use SSH key authentication, it will inform the server of this intent and will tell the server which public key to use. The server then checks its authorized_keys file for the public key, generates a random string, and encrypts it using the public key.

How to configure SSH to accept only key based authentication?

Although you can add an additional layer of security to ssh by using services like fail2ban, it’s always better to disable password based authentication, and only accept public key based authentication. How Key based Authentication in SSH Work? Key based authentication involves two keys.

Do you have to keep your SSH private key secret?

SSH private key must be kept absolutely secret. In fact you should ideally encrypt the ssh private key further to prevent somebody else accessing it rather than you. Above shown diagram depicts an overview of main steps taken by an ssh client and server, to establish authentication using public key mechanism.

How can I authenticate to a remote SSH server?

Generating a new SSH public and private key pair on your local computer is the first step towards authenticating with a remote server without a password. Unless there is a good reason not to, you should always authenticate using SSH keys. A number of cryptographic algorithms can be used to generate SSH keys, including RSA, DSA, and ECDSA.