Although advances in information and communication technologies had been developing e-society systems and making every kind of activities in our society highly convenient and efficient, people cannot reap full benefits from the systems because every privacy of a person or an organization will be revealed once the data put in the systems about it are linked. Aiming at the establishment of more secure and convenient e-society systems, this book discusses elements of schemes that cope with these threats. For example, schemes developed based on these elements enable persons and organizations to...