Re: Crypto codes #1

From: Charlie Strauss <cems_at_earthlink_dot_net>
Date: Wed Jun 08 2005 - 08:07:36 CDT

On Jun 7, 2005, at 10:59 PM, Edward Cherlin wrote:

> On Monday 23 May 2005 22:23, Charlie Strauss wrote:
>
>> On May 22, 2005, at 12:09 AM, Edward Cherlin wrote:
>>
>>> On Thursday 19 May 2005 11:36, charlie strauss wrote:
>>>
>
>
>>>> If the hash function is known or knowable does not this
>>>> reveal you ballot and provide a effective receipt? That is
>>>> to say it's going to be fairly trivial, by crypto standards
>>>> to invert the hash of a ballot string I would suspect.
>>>>
>>>
>>> We are using hashes as signatures, not as encryption. The
>>> ballot is already known, and will be published with the
>>> hash. This makes it infeasible to change one ballot and its
>>> hash, and keep the hash for the complete election unchanged.
>>>
>>
>> the point was that if you tell someone your hashcode before
>> the keys are published or the hashes are published you can
>> prove to them how you voted, since only you would be able to
>> know that hash. Myabe I'm still missing the order of
>> operations here...
>>
>
> No, the hash function is public and not dependent on a private
> key. So signatures can be computed in advance for any set of
> votes. Knowing the hash for a set of votes does not mean you
> voted that way.
>
> Next attack: Tell your vote-sellers how to vote on their way into
> the polls, without allowing them time to get to a computer to
> compute a hash. This requires a physical presence or a lot of
> activity on a pay phone very near the polls, and is vulnerable
> to surveillance. It can be circumvented using cell phones.

Considering that 95%+ voters would not know how to do this or if they
found some website to do it (unlikely) for them would have a way of
trusting it was correct and save them from a beating. Safer to do
what you are told even if you might be able to wriggle out of it.

> --
> Edward Cherlin
> Generalist & activist--Linux, languages, literacy and more
> "A knot! Oh, do let me help to undo it!"
> --Alice in Wonderland
> http://cherlin.blogspot.com
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Received on Thu Jun 30 23:17:04 2005

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