An Automated Solution to the Multiuser Carved Data Ascription Problem
Garfinkel, Simson L.
MetadataShow full item record
This paper presents a novel solution to the problem of determining the ownership of carved information found on disk drives and other storage media that have been used by more than one person. When a computer is subject to forensic examination, information may be found that cannot be readily ascribed to a specific user. Such information is typically not located in a specific file or directory, but is found through file carving, which recovers data from unallocated disk sectors. Because the data is carved, it does not have associated file system metadata, and its owner cannot be readily ascertained. The technique presented in this paper starts by automatically recovering both file system metadata as well as extended metadata embedded in files (for instance, embedded timestamps) directly from a disk image. This metadata is then used to find exemplars and to create a machine learning classifier that can be used to ascertain the likely owner of the carved data. The resulting classifier is well suited for use in a legal setting since the accuracy can be easily verified using cross-validation. Our technique also results in a classifier that is easily validated by manual inspection. We report results of the technique applied to both specific hard drive data created in our laboratory and multiuser drives that we acquired on the secondary market. We also present a tool set that automatically creates the classifier and performs validation.
The article of record as published may be located at http://dx.doi.org/10.1109/TIFS.2010.2060484
Showing items related by title, author, creator and subject.
Henderson, Glenn (Monterey, California: Naval Postgraduate School, 2013-09);Digital forensic examiners are overwhelmed by case loads and data volumes and must prioritize their work. This thesis hypothesis that digital forensic examiners can employ triage visualizations to prioritize work loads. ...
Garfinkel, Simson L. (Elsevier, 2007);"File carving" reconstructs files based on their content, rather than using metadata that points to the content. Carving is widely used for forensics and data recovery, but no file carvers can automatically reassemble ...
Brutzman, Don (2017-04-11);NPS performs many experiments with unmanned systems but few projects are able record results in a systematic reusable way. The robodata.nps.edu project is designed to establish NPS data-collection capabilities for a wide ...