SSH (Secure Shell) is an encrypted protocol to connect with a remote device. By default, it works on TCP port 22. There are two methods to connect with the remote server using SSH, one is by using the password authentication, and another way is to authenticate is by the public key. In this tutorial, we will learn how to generate an SSH key to be used for key-based authentication in CentOS 8.
Generate SSH Key
Before generating the SSH Key. Firstly, verify the SSH is installed or not. To verify, open up the terminal and type the following command.
# ssh –V
After verifying the SSH package. Now I am going to generate the SSH key, using the following command.
# ssh-keygen
To tighten up the security, you can mention the encryption algorithm according to your need, as shown below.
# ssh-keygen –t rsa # ssh-keygen –t rsa –b 4096
After entering the above command, the following output should appear.
To save the file in a suggested directory press enter.
Next, it will prompt you to enter the passphrase, leave it empty, and press enter. The following output should appear.
The SSH key is successfully generated. You can verify it by using the following command to view your SSH key.
This command will print your SSH key.
Conclusion
In this tutorial, we learned how to generate the SSH authentication key in CentOS8. We also saw how to generate the SSH key using a specific encryption algorithm.
