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Old 11-04-2012, 11:12 PM   #1
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Registered: Nov 2012
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need advice on choosing wiping scheme for bcwipe

how ya'

which wiping method is more secure when using bcwipe. Below is an excerpt of the man page

-mb German BCI/VISTR 7-pass wiping
-md U.S. DoD 5220-22M 7-pass extended character rotation wiping
-me U.S. DoE 3-pass wiping
-mf<file> read wiping scheme from file. See *notes below
-mg (default) 35-pass wiping by Peter Gutmann
-ms 7-pass wiping by Bruce Schneier
-mt 1-pass test mode: fill the start of 512-byte block with block number
-mz 1-pass zero wiping
-m N U.S. DoD 5220-22M N-pass extended character rotation wiping
Old 11-05-2012, 06:01 AM   #2
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what is the goal? probably a simple 1 pass wiping is sufficient, if you have some really - really important information you may try a 3 pass wiping also.
Old 11-05-2012, 06:04 AM   #3
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Anything better than 1 pass should be ok. The 35-pass scheme is a misinterpretation of Gutmann's 1996 paper.

Gutmann, Peter. (July 2225, 1996) Secure Deletion of Data from Magnetic and Solid-State Memory. University of Auckland Department of Computer Science. Epilogue section. (writing, "In fact performing the full 35-pass overwrite is pointless for any drive since it targets a blend of scenarios involving all types of (normally-used) encoding technology, which covers everything back to 30+-year-old MFM methods (if you don't understand that statement, re-read the paper). If you're using a drive which uses encoding technology X, you only need to perform the passes specific to X, and you never need to perform all 35 passes. For any modern PRML/EPRML drive, a few passes of random scrubbing is the best you can do. As the paper says, "A good scrubbing with random data will do about as well as can be expected". This was true in 1996, and is still true now.").
Old 11-05-2012, 01:32 PM   #4
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thanks to both of you for the info


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