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Cloud computing has emerged as a popular computing paradigm in recent years. However, today's cloud computing architectures often lack support for computer forensic investigations. A key task of digital forensics is to prove the presence of a particular file in a given storage system. Unfortunately, it is very hard to do so in a cloud given the black-box nature of clouds and the multi-tenant cloud models where many users share the same storage and the content of the storage changes frequently. In clouds, analyzing the data from a virtual machine instance or data stored in a cloud storage only allows the authors to investigate the current content of the cloud storage, but not the previous contents.
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