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Absolute OpenBSD, 2nd Edition by Michael W. Lucas

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The SSH Server sshd

Secure Shell (SSH) is a protocol for building encrypted tunnels between hosts. SSH is most commonly used for remote command-line access to a system, but you can use it as a generic wrapper around other protocols or even to build virtual private networks. One common use for SSH is to support secure file transfer protocol service, or SFTP, which doesn’t give you a shell prompt but does encrypt files and authentication information as they cross the network.

The OpenBSD project supports OpenSSH, a freely licensed client and server. OpenSSH is the most widely deployed SSH server in the world, with roughly 97 percent market share, and is generally considered the standard SSH server. Entire books have been written about OpenSSH, ...

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