ABSTRACT
Cloud computing is Internet based computing. It is located somewhere in the network. It is elastic, cost effective, on demand service, just like electricity on pay-as-per basis. In spite of all these benefits, it raises many technical, legal issues and challenges to Cloud users and Cloud service providers. While companies try to solve Cloud computing issues, the market remains some way off maturity. Gartner recently suggested that Cloud computing as used for service-enabled applications still had seven years until it reached market maturity. Because users are giving their information and data to a third party, there are concerns about who gets access. It may seem out of their control and fear the potential dissemination, deletion, or corruption of their data by unauthorized people. Cloud data can be very large, unstructured or semi-structured, and typically append-only with rare updates. Encryption is a key technology for data security.
