Cloud computing provides access to network as when need arises in the sharing environment where configurable resources are available. This provides various services such as data access, computation, software, storage. These services don't need involvement of end user like about the location and integrable part of system through which services are delivered. As data transmission over the internet or on any networks are more prone to hacking. So it is a basic requirement to maintain security of the data. This paper includes the security measures which are used for maintaining security of data.