I dedicate this dissertation work to my beloved family, my wife, my son and especially my parents for their patience, love and support. iv v ACKNOWLEDGMENTS It is the support from many people that brings me with the possibility to complete the dissertation for concluding my Ph.D. study. First and foremost, I would like to express my sincerest thanks and appreciation to my advisor Dr. Bogdan Carbunar, an eminent researcher in the community of security and privacy, for his inimitable support, meticulous guidance, insightful advice, and getting me immersed with an excellent research atmosphere. It is his great passion and endless patience that helped me to locate my research interest and develop the related research skills in the area of security and privacy. Next, my thanks goes to my dissertation committee members: Dr. Sundaraja S. Iyengar, Dr. Deng Pan, Dr. Leonardo Bobadilla, and Dr. B. M. Golam Kibria, for their helpful advices, insightful comments and great support on my dissertation and future career plans. Additionally, I am extremely grateful to my colleagues of Cyber Security and Privacy Research (CaSPR) Lab: Mahmudur, Mizanur, Mozhgan, Nestor and Ruben for their valuable insights and cooperation. I also like to thank our wonderful department staff: Olga Carbonell, Vanessa Cornwall, Ariana Taglioretti, Luis Rivera and others for their support. Finally, I would like to express my utmost gratitude to my parents, M A Jalil Talukder and Sajeda Siddiqua, whose endless love and prayer are with me in whatever I pursue. My special gratitude goes to my beloved wife Dr. Nourin Sultana, who has made me happier, stronger, more empathetic and given me the cherished gift of her love, tears and support in my times of pain. I am also grateful to my dearest son Nushjad Karim Talukder for his unexpressible sacrifice during my Ph.D. journey. I am grateful to my beloved brother, Zahidur Rahim Talukder, who gave me inspiration at all times. Without the unlimited support from them, I would never go through any tough times in my life.