Re: Security markings on the ballot

From: Douglas W. Jones <jones_at_cs_dot_uiowa_dot_edu>
Date: Mon Oct 27 2003 - 08:21:04 CST

On Sunday, October 26, 2003, at 10:36 PM, David Mertz wrote:

> I'm convinced that two images with variable placement will
> provide a good amount of entropy, and will be reliably verifiable.
>
> I guess still open is whether this placement is determined uniquely for
> every cast ballot--as I believe the hash code should be--or if the
> placements are only decided per machine or per polling place.

The visual clue is only good if all the legit ballots from a precinct
have the same placement, so that one ballot with different placement
stands out like a sore thumb.

People are really bad at computing checksums that are unique to the
item, but really good at subconsciously picking out a different item
from a set of identical items.

                                Doug Jones
                                jones@cs.uiowa.edu
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Received on Fri Oct 31 23:17:05 2003

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