We thank the Vice-chancellor and the Registrar of Anna University, Chennai, for encouraging us to bring out this book. We thank the Dean (CEG), the Director and Deputy Director (Constituent Colleges), and Head of the Department, CSE, Anna University, Chennai, for their moral support.
We take this opportunity to express our gratitude to Dr A. Kannan, Professor and Head, Department of Information Science and Technology, Anna University, Chennai, for having inspired us to write this book. In fact, we owe all our knowledge on cryptography and network security to him and each and every chapter of this book is a result of the learning experience we had with him.
We are grateful to our family and friends for motivating us to achieve our professional milestone and present our technical knowledge for the benefit of the student community. Our special thanks would always go to our parents personally.
Finally, we acknowledge the support and contributions of our colleagues and research scholars
during the ups and downs of our academic journey. We are grateful to them for having given us their time and effort to test programs for our manuscript.
Last but not least, we are obliged to the editorial team at Pearson India Education Services Pvt. Ltd, India, our publisher, who consented to bring out this book. In particular, we thank Shankari Sekar and C. Purushothaman, Editors, who have come along with us during this long journey by supporting our creative ideas.
S. Bose
P. Vijayakumar