[EM] untraceable receipts
drernie at mac.com
Wed Nov 12 16:39:02 PST 2003
On Nov 12, 2003, at 4:02 PM, David GLAUDE wrote:
> Forest Simmons wrote:
>>> It is not acceptable for the voter to run out of the voting location
>>> with a receipt. This mean I have something that proof my vote. I
>>> be forced to show my receipt and if I did not vote as I was asked...
>>> face the consequence.
>>> The secrecy of the vote make it impossible to have a hardcopy you
>>> at home!!! Not even a magic number secretly encoded or else.
>> What if you were given several receipts, and only you know which is
>> real one. One of the fake receipts could be used to satisfy the
> What was the goal of that receipts???
> 1) To remember who you voted for?
> 2) To verify your vote was counted?
> 1) is silly.
> If 2) is possible for you, it is possible for the mafia too. ;-)
I don't get #2 at all. I've actually been confused by this. If by
receipt we mean a full plaintext list of all the votes you made, then I
can see how it would be a security risk. However, it would think it
would be fairly trivial to create an ecrypted receipt that could
-verify- a vote without actually revealing the vote (at least without
For example, each vote could be used to create a 'private key - public
key' pair, as in public key infrastructures (PKI). The private key
would be used to hash a cumulative vote tally, and the public key would
be given to the voter (along with: you are the 1523rd voter). It
should be mathematically possible to audit the vote tallies, and for
the voter to confirm that his private key was used at a given step,
without revealing any information about the private key. The first
voter would hash a random seed, so that even his/her vote would not be
I may not have all the details right, but given the asymmetry of
knowledge in PKI there should be some mechanism for separating
validation from exposure.
-- Ernie P.
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