Mastering Linux Security and Hardening
Donald Tevault
Intro to Java Programming, Comprehensive Version
Y. Daniel Liang
Kali Linux - An Ethical Hacker's Cookbook
Himanshu Sharma
Linux® BIBLE
Christopher Negus
Unauthorised Access
Wil Allsopp
Cryptography Engineering
Niels Ferguson & Bruce Schneier & Tadayoshi Kohno