Authentication to Linux Machines Should Require SSH Keys

Description:

Although SSH itself provides an encrypted connection, using passwords with SSH still leaves the VM vulnerable to brute-force attacks. The most secure option for authenticating to an Azure Linux virtual machine over SSH is with a public-private key pair, also known as SSH keys.

Solution/Reference: 

To use SSH for authentication to your Linux virtual machine:
1. Create an SSH key pair for the Linux virtual machine.
2. Disable password authentication in the Linux virtual machine's configuration.
3. Update the SSH key in your Azure Resource Manager template (replace the admin password with the adminSSHKey parameter) or via the Azure CLI (with the --generate-ssh-keys command). Learn more in Create and use an SSH public-private key pair for Linux VMs in Azure.