Cloud computing is a very important revolution in IT sector. Every company/individual have big data (information) and it`s hard to carry it along with them, that`s why cloud computing came in light .Cloud computing is nothing but internet computing (internet is a hub of data that`s why we call it cloud). It provides safe, ease and fast way to store data .Gartner (Jay Heiser, 2009) defines cloud computing (Stanojevi et al., 2008;Vaquero et al., 2009; Weiss, 2007; Whyman, 2008; Boss et al., 2009) as ‘‘a style of computing where massively scalable IT enabled capabilities are delivered ‘as a service’ to external customers using Internet technologies’’.Now you can save your data on internet and easily access it from anywhere anytime. Now-a-days so many companies are providing cloud storage for your data/application or anything at very small price. The convenience and low cost of cloud computing services have changed our daily lives. It is providing so many benefits to the users but the problem is "is it safe?" for a company/individual to save or store data to cloud because it is in someone else premises and user is fetching it remotely.