Re: Critical analysis of VoteHere

From: Arthur Keller <arthur_at_kellers_dot_org>
Date: Sun Dec 14 2003 - 15:29:51 CST

At 11:42 AM -0700 12/14/03, charlie strauss wrote:
>On Dec 14, 2003, at 9:21 AM, Arthur Keller wrote:
>
>>At 9:09 AM -0700 12/14/03, charlie strauss wrote:
>>>>Another problem with the scheme is that someone can demand your
>>>>receipt and using that find out exactly how you voted the same
>>>>way that you do.
>>>
>>>No this would not work. The mapping of names-to-numbers changes
>>>for every ballot, that's the cleverness of their scheme but it
>>>introduces a whole new problem of how you assure that the mapping
>>>you are shown does not get switched. The Votehere descritpion of
>>>how this is handled gets quite elaborate and I'm not perfectly
>>>certain it succeeds. Any time someone tells you in detail about
>>>the exponents in their crytoscheme before they give you the basic
>>>flow of the method you should hang onto your wallet.
>>
>>The same way that *you* verify your ballot is the same way that
>>someone else with your receipt can find out how you voted.
>
>
>No you are not quite getting how the votehere scheme functions.
>Some one with your ballot sees what you see: that you voted for "56"
>for president. Only you and the central computer know that 56
>corresponds to Joe Blow. When you call in to verify your ballot the
>machine tells you that your vote was recorded for "56" like is says
>on your receipt.

And why can't someone else call in with your receipt, just like you
can? There must be a way for the end-voter to verify what "56" meant
for his/her own ballot.

>THus calling in only verifies that what you saw at the polls made it
>all the way to city hall undistrurbed. So the real question with
>this system is does city hall think that 56 corresponds to Joe Blow?
>And that is why they have this (too) elaborate scheme of published
>but encrypted mapping tables for maintaining the correspondence
>between 56 and joe blow for your ballot number. THe quesition is
>does their scheme succeed as described or are there holes.
>
>In the case of both paper ballots and electronic ballots procedureal
>methods and designated observers are used to ensure the vulnerable
>points of the process. We are very comfortable with how to do this
>with paper ballots. OVC is cool because it uses this plus some
>additional checks. Votehere has a scheme too which might possibly
>work but its not familiar and we have to look harder for holes in it.

-- 
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Arthur M. Keller, Ph.D., 3881 Corina Way, Palo Alto, CA  94303-4507
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Received on Wed Dec 31 23:17:11 2003

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