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Enterprises are seeking toward the cloud horizon to expand their premises facilities. It provides several services in the market, such as Infrastructure as a Service (IaaS), Platform as a Service (PaaS) and Software as a Service (SaaS). This paper will discuss challenges regarding three information security concerns: confidentiality, integrity and availability. Most of the organizations are very much concerned about the ownership of their data. This paper will not only address security challenges for cloud computing including Identity and Access Management (IAM) but also present the current state authentication, authorization and auditing of users accessing the cloud along with emerging IAM protocols and standards.