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bluesky - Re: User Anonymity

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Subject: Global-Scale Distributed Storage Systems

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Chronological Thread  
  • From: David Hopwood <hopwood AT zetnet.co.uk>
  • To: bluesky AT franklin.oit.unc.edu
  • Subject: Re: User Anonymity
  • Date: Sat, 17 Feb 2001 17:16:08 +0000


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Wei Dai wrote:
> Let's talk about how to reduce the penalties (for example through
> plausible deniability) or the probability of getting caught. To be
> concrete, let me propose an enforcement mechanism the authorities may use.
> A list of banned hashes is published. Any server found to be storing or
> transporting any object that hashes to an entry in the list will be
> confiscated. Now the enforcers periodicly request items on the list, and
> confiscates any server that responds. This mechanism seems effective
> against any conceivable storage system, so perhaps if jurisdiction
> shopping can't do the job, nothing else can.

If the blocks stored by servers encode information about more than one
(unrelated) file, then it is more difficult for the enforcers to argue
that any particular blocks should be banned. Marc Waldman and David
Mazières have a paper on a design that does this (using a variant of
Shamir secret sharing); they call it "entangling" files. It looked to
me as though this idea could be added on to almost any system. I'll ask
them whether the paper can be put on the web.

- --
David Hopwood <hopwood AT zetnet.co.uk>

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