In this article we going to discuss about Passwordless authentication between the servers.

In the ever-expanding realm of cybersecurity, where breaches and data theft loom as constant threats, the need for innovative and secure authentication methods has never been greater. Traditional password-based systems, once the cornerstone of digital security, are increasingly vulnerable to sophisticated attacks and user-related vulnerabilities. In response, a new frontier in authentication has emerged: passwordless authentication. By eliminating the reliance on easily comprisable passwords, organizations can bolster their security posture and create frictionless user experiences.

Creating passwordless authentication between servers involves implementing secure and efficient methods to establish trust and communication without relying on traditional passwords. Below are steps to help you achieve passwordless authentication between servers.


Implementing passwordless authentication between servers typically involves setting up secure key-based authentication using SSH (Secure Shell). Here are the prerequisites and steps you need to follow to achieve passwordless authentication between servers:

  • AWS account.
  • Amazon EC2(Amazon Linux 2)
  • A user with the sudo privilege command.

Steps to Set Up Passwordless Authentication:

Step #1: Generate SSH Key Pair (if not already done):

If you haven’t generated an SSH key pair on the client machine, do so using the following command:

ubuntu@Rushi-InfoTech:~$ ssh-keygen -t rsa -b 2048

This command will generate a new SSH key pair (public and private keys). You can specify a different encryption algorithm or key length if needed.

Step #2: Copy the Public Key to the Server:

Use to copy the public key to the server. Replace username with your username and server_ip with the IP address or hostname of the server:

ssh-copy-id username@server_ip

This command will prompt you for the user password on the server. Once you enter the password, your public key will be added to the ‘~/.ssh/authorized_keys' file on the server.

Step #3: Configure SSH on the Server:

Ensure that the SSH server is configured to allow key-based authentication. Open the SSH configuration file on the server:

sudo nano /etc/ssh/sshd_config

Make sure the following configurations are set:

PasswordAuthentication no
PubkeyAuthentication yes

These lines disable password authentication and enable public key authentication. After making changes, restart the SSH service:

sudo service ssh restart

Step #4: Test Passwordless Authentication:

Try logging into the server without being prompted for a password:

ssh username@server_ip

If everything is set up correctly, you should be logged in without entering a password.

Step #5: Disable Root Login (Recommended for Security):

For security reasons, it’s often recommended to disable root login via SSH. Edit the SSH configuration file on the server again:

sudo nano /etc/ssh/sshd_config

Ensure the following line is set:

PermitRootLogin no

This prevents direct root logins via SSH.


  • Permissions: Ensure that the .ssh directory on both the client and server has the correct permissions. The directory should have permissions 700, and the authorized_keys file inside it should have permissions 600.
  • Key Management: Keep your private key secure. Do not share it, and protect it with a passphrase if needed.

By following these steps, you can establish passwordless authentication between servers, enhancing security and convenience in server management tasks.


Passwordless authentication offers a secure and convenient way to access servers or services without the need to enter a password each time.

Passwordless authentication, especially when implemented using secure key-based methods like SSH, significantly enhances the security posture of systems and networks. It’s a fundamental practice in modern cybersecurity, providing a balance between robust security and user convenience. However, its effectiveness relies heavily on proper key management practices and a thorough understanding of potential risks and mitigation strategies. When implemented and managed correctly, passwordless authentication is a cornerstone of secure, efficient, and user-friendly system access and management.

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