First:

http://shop.oreilly.com/product/9780596008956.do

Second

https://www.amazon.com/SSH-Mastery-OpenSSH-PuTTY-Tunnels/dp/1642350028

Maybe third

http://shop.oreilly.com/product/9781597492836.do

On Tue, Jan 7, 2020 at 1:55 PM grarpamp <grarpamp@gmail.com> wrote:

https://gravitational.com/blog/ssh-handshake-explained/