Abstract: The paper is about the study of the Cloud computing concepts which contains the different services such as the IaaS, PasS, SaaS and DaaS. There are so many other services offered by the cloud. But in cloud, the security of data is the main aim due to centralized information that is shared among the users and the examples of cloud provider are Google, Amazon, Salesforce.som and Microsoft etc. The data can be hamper include data leakage, insecure interface, sharing of resources, data availability and inside attacks. These services offered by internet and are on demand as the user required and these services are pay per use of it. The user can access to a pool of shared resources namely networks, storage, servers, services and applications, without physically acquiring them. This paper aims to be study the security algorithm about RSA algorithm.

Keywords: Cloud Computing, RSA, IaaS, PasS, Saas, Webos.