International Journal of Advanced Research in Computer Science & Technology (IJARCST)
While using cloud services they impose new security challenges, which is the biggest obstacle. Lot of research activities has been triggered in this direction, which results in a quantity of proposals targeting the various security threats. Simultaneous usage of multiple clouds reduces the risk for data and applications in a public cloud. Recently several approaches employing this paradigm have been proposed. They differ in partitioning and distribution patterns, technologies, cryptographic methods, and targeted scenarios as well as security levels.