First:
   [1]http://shop.oreilly.com/product/9780596008956.do
   Second
   [2]https://www.amazon.com/SSH-Mastery-OpenSSH-PuTTY-Tunnels/dp/16423500
   28
   Maybe third
   [3]http://shop.oreilly.com/product/9781597492836.do

   On Tue, Jan 7, 2020 at 1:55 PM grarpamp <[4]grarpamp@gmail.com> wrote:

     [5]https://gravitational.com/blog/ssh-handshake-explained/

References

   1. http://shop.oreilly.com/product/9780596008956.do
   2. https://www.amazon.com/SSH-Mastery-OpenSSH-PuTTY-Tunnels/dp/1642350028
   3. http://shop.oreilly.com/product/9781597492836.do
   4. mailto:grarpamp@gmail.com
   5. https://gravitational.com/blog/ssh-handshake-explained/