Today, Cloud Computing has paved the way for enormous computing and storage. Cloud servers are third party systems which could be rented on demand basis and paid on usage basis. More and more users are adopting cloud based applications but the only factory that hinders its development is security issue. Users have a fear of trusting a third party system like cloud and they show reluctance to outsource their sensitive information to cloud. Encryption seems to be a direct solution but it limits the computability on data. Hence encryption schemes should be chosen based on the application they need to implement. In this article we study the basic encryption schemes which are widely used in cloud scenario. We compare these schemes in terms of their computational complexity, security, performance etc.
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