One Big File Is Not Enough: A Critical Evaluation of the Dominant Free-Space Sanitization Technique

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One Big File Is Not Enough: A Critical Evaluation of the Dominant Free-Space Sanitization Technique

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Title: One Big File Is Not Enough: A Critical Evaluation of the Dominant Free-Space Sanitization Technique
Author: Malan, David J.; Garfinkel, Simson

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Citation: Garfinkel, Simson L., and David J. Malan. 2006. One big file is not enough: a critical evaluation of the dominant free-space sanitization technique. Lecture Notes in Computer Science 4258: 135-151.
Access Status: At the direction of the depositing author this work is not currently accessible through DASH.
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Abstract: Many of today’s privacy-preserving tools create a big file that fills up a hard drive or USB storage device in an effort to overwrite all of the “deleted files” that the media contain. But while this technique is widespread, it is largely unvalidated. We evaluate the effectiveness of the “big file technique” using sector-by-sector disk imaging on file systems running under Windows, Mac OS, Linux, and FreeBSD. We find the big file is effective in overwriting file data on FAT32, NTFS, and HFS, but not on Ext2fs, Ext3fs, or Reiserfs. In one case, a total of 248 individual files consisting of 1.75MB of disk space could be recovered in their entirety. Also, file metadata such as filenames are rarely overwritten. We present a theoretical analysis of the file sanitization problem and evaluate the effectiveness of a commercial implementation that implements an improved strategy.
Published Version: http://dx.doi.org/10.1007/11957454_8
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:3203650

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  • FAS Scholarly Articles [7219]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University
 
 

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