Re: Bar code choice

From: Edward Cherlin <edward_dot_cherlin_at_etssg_dot_com>
Date: Sat Sep 13 2003 - 14:28:21 CDT

On Saturday 13 September 2003 11:52 am, David Mertz wrote:
> Edward Cherlin <> wrote:
> |Not exactly. There are people who can read data xored with a
> |fixed value. You use the key (the ballot number) to generate
> | a pseudo-random bitstring to xor the data with.
> I apologize, Ed. I glanced at your note, then mentioned it in
> a message responding to Alan. I was under the
> misunderstanding you proposed separate generation of
> pseudo-random XOR bitstrings. We are on the same page that
> ballot-id's are the bitstring.

No need to apologize. That's what I did suggest, using the ballot
number to seed the psoudo-random number generator.

> Just to emphasize Ed's point: XOR'ing barcodes with a fixed
> string has no value whatsoever. If the same "key" is used on
> every ballot, it just means that a *different*, but equally
> recognizable, pattern would occur for a particular vote.

Well, the original suggestion was to xor the data with the ballot
number repeated over and over, so it would be a different number
on each ballot. I thought that doing that would make a sequence
of binary choices on ballot measures relatively readable, but as
you say it doesn't really matter. Certainly not in a demo. Let
us wait to see what the emerging standards require, and not go
off half-cocked.
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Edward Cherlin, Simputer Evangelist
Encore Technologies (S) Pte. Ltd.
Computers for all of us,
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Received on Tue Sep 30 23:17:04 2003

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