ii Acknowledgments My gratitude goes to Nicolas Cerf for introducing me to the fascinating field of quantum information, and for giving me the opportunity to pursue this thesis. I would also like to thank all of my colleagues at the QuIC, in particular Lo¨ıck Magnin who read a preliminary version of this manuscript, and Louis-Philippe Lamoureux who has become a true friend. Some of the results ...

This is to certify that this thesis titled " DNA Cryptology: A Brief Survey And A DNA Algorithm For Breaking A Propositional Logic Based Cryptosystem " submitted by Bireswar Das towards partial fulfillment of requirements for the degree of M.Tech. in Computer Science at Indian Statistical Institute, Kolkata embodies the work done under my supervision. i Acknowledgments I take pleasure in thanki...

OF THE DISSERTATION........................................................ii ACKNOWLEDGMENTS.........................................................................iv TABLE OF CONTENTS............................................................................vi LIST OF FIGURES...............................................................................viii LIST OF TABLES......................