• Prinka
• Mr.Anil Kumar

Cloudcomputingisanewbusinessmodelthathavegeneratedrevolutionininformationtechnology(IT)industry. Itprovidesscalable infinite storage space, Virtualized IT resource on demand over the Internet with pay only for service or resource utilized.In the last few years,cloudcomputinghasgrownapromisingbusinessconceptfortheITcompaniesanddataconcerningtolargenumberofindividuals and companies are placed in the cloud which is under the direct control of cloud service provider,with this so many security issues have raised. Despite of so many advantages of cloud computing, companies and customers are still hesitating for deploying their business and sensitive data in the cloud. Data security is one of the major issues that reduces the growth of cloud computing. It is concerned with confidentiality,integrityandavailabilityofdata.Inthispaper,areviewofthedifferentdatasecurityissuesandtheirexistingremediesand technology like Blockchain is used to provide process integrity by ensuring any block or even any modification that adds to chain cannot be edited and provides a very high security and addressing the interoperability, transparency, redundancy etc.Data Security is maintained so that unauthorized user may not access the secure data for misuse with the help of blockchain technology which doesn’t need any involvement of third party.

Data confidentiality; data integrity; data fragmentation; encryption; blockchain

"Evaluation of security challenges in cloud computing", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 5, page no.172-177, May-2019, Available :http://www.jetir.org/papers/JETIR1905I26.pdf

"Evaluation of security challenges in cloud computing", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 5, page no. pp172-177, May-2019, Available at : http://www.jetir.org/papers/JETIR1905I26.pdf