Abstract: In Cloud computing, data security is the major issue. Cloud computing environment security issues are handled by the system administrator or Cloud administrator. All the services related to data storage, data Availability is managed by third party who owns the infrastructure .Researches on Security in single Cloud is paid more attention than in Multi-Cloud. Organizations are migrating towards multi-Cloud due to its ability to overcome issues like data Availability, integrity and authenticity in this paper; we describe an architecture for security of data in multi-Cloud environment. The security of the data can be done by using different secret sharing algorithm. A systematic analysis of the various security algorithms is done, to improve security on multi-Cloud. This architecture will address data security in multi-Cloud environment and enhance security to some extent.

Keywords: Multi-Cloud, AES, DES, 3DES, RSA, CSP.