SSH

SSH, or Secure Shell, enables users to connect to a remote server securely.

the main advantage is server authentication, through the use of public key cryptography.

Here are a few things you need to tweak in order to improve SSH server security.

IMPORTANT: Before making any modifications to the /etc/sshd_config file, make a backup by:

sudo cp /etc/ssh/sshd_config /etc/ssh/sshd_config.factory-defaults

…and

sudo chmod a-w /etc/ssh/sshd_config.factory-defaults

NOTE: Not all of the possible changes mentioned below have to be made.

Some changes are not recommended to be made but may offer tighter security depending on your requirements.