Date Added: Jan 2010
While the economic case for cloud computing is compelling, the security challenges it poses are equally striking. This paper strives to frame the full space of cloud-computing security issues, attempting to separate justified concerns from possible over-reactions. The paper examines contemporary and historical perspectives from industry, academia, government, and "Black hats". It argue that few cloud computing security issues are fundamentally new or fundamentally intractable; often what appears "New" is so only relative to "traditional" computing of the past several years. Looking back further to the time-sharing era, many of these problems already received attention.