This document summarizes information security in cloud computing. It begins by introducing cloud computing and noting that information security is a critical risk for organizations moving to the cloud. It then classifies cloud security based on the three cloud service models of SaaS, PaaS, and IaaS. For each type of security, attributes are identified and some of the world's major cloud service providers are compared. Infrastructure security, application security, and information security like data storage and privacy security are discussed. Several tables provide comparisons of cloud service providers for different security areas. Recommendations are made for organizations choosing cloud providers regarding information security.