International Journal of Computing Science and Information Technology (IJCSIT)
There is always a risk of data owner's identity and privacy when data is stored in a untrusted cloud. As the data can be easily accessed by others in the cloud, there is also a risk of data modification or data stealing. To overcome this, a method that encrypts the data before it is stored in the cloud and a technique to find the guilt agent is proposed. This paper also focuses on the dynamic groups that work in organizations that use cloud for their data storage, where a newly joined user can directly decrypt the files stored in the cloud before he joined the cloud.