Cloud computing is a new service delivery paradigm that aims to provide standardized services with self-service, pay-per-use, and seemingly unlimited scalability. This paradigm can be implemented on multiple service levels (infrastructures, run-time platform, or actual Software as a Service). They are are expected to be an important component in the future Internet. This article introduces upcoming security challenges for cloud services such as multi-tenancy, transparency and establishing trust into correct operation, and security interoperability. For each of these challenges, we introduce existing concepts to mitigate these risks and survey related research in these areas.
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