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The Cloud Computing concept offers dynamically scalable resources provisioned as a service over the Internet. Economic benefits are the main driver for the Cloud, since it promises the reduction of capital expenditure (CapEx) and operational expenditure (OpEx). In order for this to become reality, however, there are still some challenges to be solved. Amongst these are security and trust issues, since the user's data has to be released to the Cloud and thus leaves the protectionsphere of thedoi:10.1109/cloud.2009.60 dblp:conf/IEEEcloud/JensenSGI09 fatcat:t5jsk2ib3bahphsokb3iyi3rk4