Now a days every industry needs more income with less investment behind infrastructure. Here, the new era of Cloud computing comes where the user can have everything on rent and "pay as go" fundamental. Cloud users are able to store their valuable data on Cloud premises and make themselves free from local burden. While users data is available on Cloud servers, it is very important for the user that data must be secure when it is in transition and even after it has been stored on server. Most of the researchers think for the user centric(side) scenario i.e mainly consider the security issue related to Cloud users like Integrity checking, Authentication, Versioning Etc. On the other hand, some researchers provide their view related to working of Cloud service providers i.e. Database encryption, Security based on Metadata, Data Obfuscation Etc. To have proper confidentiality, Security and integrity of data, this paper presents two techniques, that is: Encryption, authentication at client side as well as Data Obfuscation at server side. Encryption helps user to provide secrecy to its data when it is transferred in the network. Data obfuscation helps service provider to secure the users data on his premises. By applying these two techniques, the user and Service provider gets maximum protection against intruders and unauthorized access.

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Cloud computing is now a day's become most attracted phenomena to use for a large-scale organization or for individual who need various network services with least cost. Normally, individual's information is stored on public Cloud which is available to everyone for access. This fundamental raise some issue opposite to flexible services provided by Cloud providers, like Confidentiality, Integrity, Availability, Authorization and many more. To protect the data, lots of options available now a days and most preferable way is to use encryption. Encryption only cannot provide enough protection while considering user's sensitive information, as well as it consumes more time to process encryption and decryption. To remove the burden of Cloud server, as well as to keep adequate security to user's information in Cloud environment, in this paper, we propose a methodology for combining both techniques, viz. obfuscation and encryption. The user data may be encrypted if it requires security for its files or document, and the DaaS service of Cloud must be secured using obfuscation techniques. Using this two-way approach, we can say that the proposed scheme offers enough security towards anonymous access and preserve privacy even of the information available on Cloud Servers. We also aim to provide proper integrity checking mechanism, better access control mechanism which lessens the burden of Client as well as service provider.

Cloud computing is a computing technique, where a large group of systems are connected to private or public networks, where data owner can store his data on remote systems and frees himself from storage burden and uses the data ondemand, anytime, everywhere. As, a Cloud data user does not possess direct control of his data, security is one of the few challenging issues which needs to be addressed. Security in Cloud computing can be addressed in many directions viz. authentication, integrity, confidentiality and many more. Data integrity or correctness is an issue where there may be some unauthorized alteration in the data without consent of the data owner. In this paper we address the issue of storage correctness in Cloud computing and propose operational algorithms which may be used to build a complete solution.