SSH: The Secure Shell (The Definitive Guide)
Barrett, Silverman, & Byrnes / O’Reilly

Terms & Definitions

There are lots of overlapping ideas and terms in SSH, complicated by differing usage among various implementations. For definiteness, we use the following terms. You may disagree with our choices, but you didn't have to write a 500-page book talking about all this stuff and try to avoid confusion.