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[liberationtech] Auto expiring document/files & 'rights to be forgotten'

Steve Weis steveweis at
Thu Jan 26 11:39:01 PST 2012

You might be thinking of Vanish by Yoshi Kohno et al.:

Ed Felten, Alex Halderman, Brent Waters, et al. have a Sybil attack against
it here:

Regardless of the attack, Vanish does not prevent local copies of the data.
As people have already pointed out, if you let someone view static content
on their own hardware, they can copy it. You can make it inconvenient and
perhaps lossy, but can't prevent it completely.

On Thu, Jan 26, 2012 at 11:18 AM, Tom Ritter <tom at> wrote:

> There was a technology (that didn't work for realistic threat models)
> that took a document and split among a number of servers.  Over time,
> these pieces would decay and be removed until you were no longer able
> to reassemble the document.  That sounds similar to what you're after.
> It doesn't work for all the reasons already mentioned, but it was a
> concrete open source implementation of an attempt.  If only I could
> remember its name...
> -tom
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