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Change-link 2.0: a digital forensic tool for visualizing changes to shadow volume data

We present Change Link 2.0, a coordinated and multiple view tool for digital forensics which supports an understanding of how shadow volume data have changed over time. An improvement over the original Change-Link tool [25], Change-Link 2.0 provides an overview, a directory-tree view, a directory content view, and a metadata view in a side-by-side, split-screen, linked-view interface that supports easy browsing and detection of files and directories that have changed over time. This data visualization approach supports faster comprehension of digital forensic data, quick detection of anomalous data, and a better understanding of "what happened?." Input to Change-Link 2.0 is an evidentiary hard drive containing multiple versions of files and directories which have been archived by the Microsoft Volume Shadow Copy Service [28]. Our contributions include data visualization techniques that support an overview of the entire dataset, as well as an understanding of how the directory-tree structure, individual directory content, and file and directory metadata have changed over time. Change-Link 2.0, and its predecessor, are the first data visualization tools that we are aware of which support the forensic examination of shadow volume data.