The concept of cloud computing is a very vast concept which is very efficient and effective security services.The cloud computing methodology is a conceptual based technology which is used widely now a day. But in data privacy protection and data retrieval control is one of the most challenging research work in cloud computing, because of users secrete data which is to be stored by user. An enterprise usually store data in internal storage and then tries to protect the data from other outside source. They also provide authentication at certain specific level. Cloud computing offers an innovative business model for organizations to adopt IT services without upfront investment. Despite the potential gains achieved from the cloud computing, the organizations are slow in accepting it due to security issues and challenges associated with it. Security is one of the major issues which hamper the growth of cloud.The idea of handing over important data to another company is worrisome; such that the consumers need to be vigilant in understanding the risks of data breaches in this new environment. This paper introduces a detailed analysis of the cloud computing security issues and challenges focusing on the cloud computing types and the service delivery types. This paper mainly proposes the core concept of secured cloud computing. It suggests the cloud computing based on separate encryption and decryption services from the storage service.Due to this increasing demand for more clouds there is an ever growing threat of security becoming a major issue. This paper shall look at ways in which security threats can be a danger to cloud computing and how they can be avoided.

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Deploying cloud computing in an enterprise infrastructure brings significant security concerns. Successful implementation of cloud computing in an enterprise requires proper planning and understanding of emerging risks, threats, vulnerabilities, and possible countermeasures. We believe enterprise should analyze the company/organization security risks, threats, and available countermeasures before adopting this technology. In a cloud computing environment, the entire data reside over a set of networked resources, enabling the data to be accessed through virtual machines. Since these data centers may lie in any corner of the world beyond the reach and control of users, there are multifarious security and privacy challenges that need to be understood and taken care of. Also, one can never deny the possibility of a server breakdown that has been witnessed, rather quite often in the recent times. There are various issues that need to be dealt with respect to security and privacy in a cloud computing scenario. This extensive survey paper aims to elaborate and analyze the numerous unresolved issues threatening the Cloud computing adoption and diffusion affecting the various stake-holders linked to it.

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