IOSR Journal of Engineering
Cloud computing is a technique to deliver software, storage and processing. It increases system's capability without changing the existing infrastructure, educating new people or taking license for the software. It improves the existing software capabilities and extends the Information Technology resources. In recent years, cloud computing has grown up rapidly and boosted the business concept in IT industry. Despite of all the achievements in cloud computing, security is still a critical challenge in cloud computing paradigm. These challenges include user's secret data (like health and financial data) loss, leakage and disclosing of privacy.