This book focuses on concept, implementation, and analysis for those who want to study Cloud security. The Cloud security area is broad and can be studied in wide-ranging perspectives. Therefore, this book provides initial direction to give a better understanding of Cloud security before the further investigation is been studied. Cloud computing becomes a powerful trend in the development of ICT and its advances as well as commerce and industry fields. The availability of Cloud services by existing Cloud Service Providers (CSPs) already proved its effectiveness in sharing services to a large-scale number of users. In general, the security aspect required accountable element during data transmission where comprises assurance of obligations to protect the data/information including concerns on who process the data and where the data been stored. Optimistically, this book able to help the readers to gain the scope of Cloud security at glance but comprehensive.