Про криптографию
Виктор де Касто
Iptables Tutorial 1.2.2
Oskar Andreasson
Linux Command Line and Shell Scripting Techniques
Vedran Dakic & Jasmin Redzepagic
Mastering Docker - Second Edition
Russ McKendrick & Scott Gallagher
Linux Bible (10th edition)
Christopher Negus
GitHub For Dummies
Sarah Guthals & Phil Haack
Cyber Security and Network Security
Sabyasachi Pramanik & Debabrata Samanta & M. Vinay & Abhijit Guha