Out of the box, secure shell is fairly secure. With the help of ssh key authentication, you can lock down secure shell so that only specific machines can log in. Here's how. If you’re a Linux ...

The command will move through a series of prompts. First, it will ask where you want to save the keys. Unless you are an expert, accept the default. This will create an “id_rsa” and an “id_rsa.pub” ...