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South African Information Security Multi-Conference (SAISMC 2010)

South African Information Security Multi-Conference (SAISMC 2010)
Port Elizabeth, South Africa, May 17-18, 2010
ISBN: 978-1-84102-256-7

Title: Optimal Path Construction for Fragmented File Carving
Author(s): Hwei-Ming Ying, Vrizlynn LL Thing
Reference: pp248-260
Keywords: Fragmented data carving
Abstract: Fragmented File carving is an important technique in Digital Forensics to recover files from
their fragments in the absence of the file system allocation information. In this paper, the
fragmented file carving problem is formulated as a graph theoretic problem. Using this model,
we describe two algorithms, “Optimal Carve” and “Probabilistic-based Carve”, to perform file
reconstruction and recovery. Optimal Carve is a deterministic technique to recover the best file
construction path. We show that this technique is more efficient and accurate than existing
brute force techniques. The Probabilistic-based Carve technique involves a trade-off between
the final score of the constructed path of the file and the file recovery time to allow a faster
recovery process for highly fragmented files.
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