The pursuit over the past five years culminating in this dissertation would not be possible without the support and assistance of the following individuals and organizations:Associate Professor Yeo Chai Kiat My supervisor, for her strong guidance and insight, unwavering support, and constant motivation in the technical aspects of my research and in advising me on coping as a PhD candidate.Senior Research Scientist Leong Peng Chor For his insight regarding security, especially for Chapter 1, and the eye-opening discussions.