Date of Submission


Date of Award


Institute Name (Publisher)

Indian Statistical Institute

Document Type

Doctoral Thesis

Degree Name

Doctor of Philosophy

Subject Name



Applied Statistics Unit (ASU-Kolkata)


Sarkar, Palash (ASU-Kolkata; ISI)

Abstract (Summary of the Work)

At the beginning of 2003, I was searching for a suitable area to do my PhD. My respected guide Prof. Palash Sarkar assigned me to do a survey work on block cipher cryptanalysis. I found myself very interested in this area. I am very lucky that I joined into a golden group – Cryptology Research Group of India formed by our beloved teacher Prof. Bimal Roy and had the opportunity to work with Prof. Palash Sarkar, Dr. Subhomoy Maitra, Prof. Rana Barua and many others. I have been inspired by many persons during my PhD work.I would like to begin by thanking my advisor Prof. Palash Sarkar for his unlimited involvement to proceed with my research work. He always helped and tried to motivate me in my research. Without his solid and innovative effort, I do not think I would have reached at my current position. I also remember him as a good teacher for his interactive classes during my M.Tech course from 1999-2001.The name of the next person that comes to my mind is Prof. Bimal Roy. He is my teacher in both of my M.Stat and M.Tech courses. I found him the most student-friendly teacher in my entire student life. He introduced me to the area of Cryptography and Coding Theory. He always provided his helping hand in several problems (academic and also non-academic) during the last couple of years. I feel proud myself that I got an opportunity to do a joint paper with him.I convey my thank to Prof. Rana Barua, Dr. Subhomoy Maitra and Dr. Pinakpani Pal for their inspiration and all kinds of supports to achieve my goal.During my long journey at ISI, I came in contact with many scientists like Prof. Sankar Kumar Pal, Prof. Rajeev Karandhikar, Prof. Arijit Choudhary, Dr. Mandar Mitra, Prof. C. A. Murty and many more. I am grateful to them for their teaching and guidance.I must thank all anonymous referees of my published papers, whose comments have always added a new dimension to my works. I would like to convey my hearty thanks to Prof. Alex Biryukov for his valuable comments and suggestion during my preparation of the final draft and presentation slide for SAC 2005 to present our joint paper. I am also thankful to Mr. Michael Wiener for providing me a valuable research paper. I thank Prof. Harald Niederreiter, Prof. Willi Meier, Prof. Vincent Rijmen and Prof. Amr Youssef for carefullyreading an initial draft of Chapter 5 in this dissertation.I would like to thank the anonymous reviewer of this thesis for his valuable comments.I have spent my graduation period at Ramakrishna Mission Vidyamandira, Belur Math, where I got a fantastic spiritual environment to explore myself in every positive area of life provided by the Maharajs (Monks). My hostel superintendent Swapan Maharaj showed me the right direction for higher studies. I am also grateful to Biswarup Maharaj for his spiritual inspiration. There I got some real knowledgeable and good teachers like Sachin Bakshi, Late Mohanlal Singharoy, and others.I am thankful to the faculty and staff of the Applied Statistics Unit for all the help during my PhD study in ISI. I would also like to express my special thanks to all members of Cryptology Research Group of ISI and my room mates: Bappa, Jayanta, Anupam, Debasis and Tarun.Last, but not the least I must express my thanks to my family. My mother has always been a great source of strength. My father, brothers, sister and our family friend Radhabinod Pal are always with me in my journey with their well wishes. Finally, I must thank Ratna for her inspiration to complete this thesis.


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