See also

This section deliberately doesn't go into the minutia of SSH key exchange or the different types of key (with the exception of the two used in our example). There are excellent books on SSH that can provide a wealth of information, and the OpenSSH developers themselves are constantly working on improvements to the software. OpenSSH is only one implementation of SSH, but it is by far the most popular. It is the default on every Linux distribution I've used, it's in use on macOS, and it's the standard on the BSDs (especially OpenBSD, where it's developed).