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 securityFully updated to reflect new developments in network securityIntroduces a chapter on Cloud security, a very popular and essential topicUses everyday examples that most computer users experience to illustrate important principles and mechanismsFeatures a companion website with Powerpoint slides for lectures and solution manuals to selected exercise problems, available at http://www.cs.uml.edu/~wang/NetSec