Abstract: As predicted, computing has become the fastest growing services in recent years and has acquired a new dimension in the form of cloud computing. It is greatly influenced by merging of internet with computing, sharing of resources and combining the advancements in technologies that paved to various cloud offerings. The fundamental guidelines of cloud computing model are computing, storage, Security & programming as an administrator. But the size of computation & demand for higher computation is growing very rapidly which is causing an uneven and heavy workload on cloud resources. Due to this rapidly increase of data, there is the need of security as per the increasing demand. But due to this increasing cloud demand, security of cloud data has become a problem for the future. So, here we are discussing about the security issues in the cloud data, service and deployment models.

Keywords: Cloud Computing, Cloud Security Issues, Cloud Service model, Cloud Deployment model.