Cloud computing is a model for enabling ubiquitous, convenient, on-demand network access to a shared pool of configurable computing resources (e.g., networks, servers, storage, applications and services) that can be rapidly provisioned and released with minimal management effort or service provider interaction. Cloud computing is a general term for the delivery of hosted services over the internet. Cloud computing enables companies to consume the resources and compute their utility rather than building and maintaining computing infrastructure. A cloud database is a database that has been optimized or built for a virtualized computing environment. Since these data-centers may be located in any part of the world beyond the reach and control of users, there are multifarious security and privacy challenges that need to be understood and addressed. Cloud has been prone to various security issues like storage, computation and attacks like Denial of service, Distributed Denial of Service, Eavesdropping, insecure authentication or logging etc. Privacy preservation is main security issue in public cloud. This paper focuses on various security mechanisms that are provided in the enterprises and also discusses few of the common security mechanisms like auditing, authentication, authorization, encryption and access control.

Cloud database, Security, Privacy Preservation, Auditing, Authentication, DaaS

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