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[liberationtech] CryptoParty Handbook

Steve Weis steveweis at
Thu Oct 4 18:54:14 PDT 2012

For what it's worth regarding multiple passes to sanitize data:

On Thu, Oct 4, 2012 at 5:06 PM, Seth David Schoen <schoen at> wrote:
> I was also concerned by the "Securely Destroying Data" section.  Although
> it
> acknowledges some situations under which erased data (or even overwritten
> data) could be recovered, it seems to treat these situations as exceptional
> and multiple-overwrite tools generally reliable.  It doesn't mention that
> these tools are potentially quite untrustworthy on current filesystems even
> under normal conditions, because of data journaling.  (I first learned
> about
> this problem from John Gilmore.)  In fact, even the man page for shred
> gives
> a warning about this:
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