The field of database security has expanded greatly, due to the rapid development of the global inter-networked infrastructure. Databases are no longer stand-alone systems accessible only to internal users of organizations. Today, many businesses must allow selective access from different security domains. New data services emerge every day, which brings new and more complex challenges to those whose job is to protect data security. The internet and the web offer means for collecting and sharing data with unprecedented flexibility and convenience, and presents threats and challenges of its own. This book identifies and addresses these new challenges and more. This volume presents a wide range of active areas, closely related to database security by distinguished leaders within this field. Solutions are included. Secure Data Management in Decentralized Systems is designed for a professional audience of practitioners and researchers in industry. This book is suitable for graduate-level students in computer science as well.