This document provides a summary of the book "Introduction to Network Security: Theory and Practice" by Jie Wang. It is a 438-page introductory textbook covering fundamental and newer topics in network security, including electronic cash, bitcoin, peer-to-peer networks, SHA-3, e-voting, and Zigbee security. The book is fully updated on new developments in network security and includes a new chapter on cloud security. It uses everyday examples to illustrate important security principles and mechanisms.