Introductory textbook in the important area of network security for undergraduate and graduate students * Comprehensively covers fundamental concepts with newer topics such as electronic cash, bit-coin, P2P, SHA-3, E-voting, and Zigbee security * Fully updated to reflect new developments in network security * Introduces a chapter on Cloud security, a very popular and essential topic * Uses everyday examples that most computer users experience to illustrate important principles and mechanisms * Features a companion website with Powerpoint slides for lectures and solution manuals to selected exercise problems, available at http://www.cs.uml.edu/~wang/NetSec