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Organizations are increasingly turning to the cloud for data processing and storage. Storing data in the cloud is advantageous for numerous reasons: the elasticity of cloud environments ensures that only storage used is paid for, while tasks such as backup, replication, and geographic diversification of data are effectively outsourced to cloud storage providers. However, unfettered access to this environment and arbitrary migration of data means that determining the origin of information, or equally importantly, determining the modifications and chain of custody undergone by this information before it has assumed its current form, is a virtually intractable problem given the current tools available to one.
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