Cryptography and network security / Behrouz A Forouzan , Debdeep Mukhopadhyay. Forouzan, Behrouz A. Mukhopadhyay, Debdeep. Computer networks -- Security measures. Cryptography. 005.82 FOC Includes bibliographical references and index. New Delhi : Tata McGraw Hill Education , c2010 (4th printing 2011) . c2010 (4th printing 2011) . 2010 Text xiv, 702 p.: eng