This book introduces the fundamental concepts of homomorphic encryption. From these foundations, applications are developed in the fields of private information retrieval, private searching on streaming data, privacy-preserving data mining, electronic voting and cloud computing. The content is presented in an instructional and practical style, with concrete examples to enhance the reader's understanding. This volume achieves a balance between the theoretical and the practical components of modern information security. Readers will learn key principles of homomorphic encryption as well as their application in solving real world problems.

Introduction.- Homomorphic Encryption.- Fully Homomorphic Encryption.- Remote End-to-End Voting Scheme.- Nearest Neighbor Queries with Location Privacy.- Private Searching on Streaming Data.