The Internet and the worldwide web play an increasingly important role in our private and professional activities, for example in accessing information about cultural, political, economical, medical or scientific information. Many people assume that they can access such information privately.

This book addresses the topic of querying information privately in a systematic and comprehensive way, developing practical solutions in the context of database systems. Based on thorough theoretical analyses, the author develops concepts for solutions of real-world settings, in particular for scalable database systems.