Cloud computing is gaining popularity among different users and organizations and one of the prominent areas of research in the present world. It delivers on- demand computing services including networking, software, storage, etc through the Internet. There are many advantages like cost-saving, flexibility in capacity, availability, etc. those exist in cloud computing but the major drawback is to create a secure cloud storage system. Additionally, cloud environments are controlled by several service providers like Amazon, Microsoft, Google's App Engine, etc. Cloud environment provides...