Architecture update on barcode obfuscation

From: David Mertz <voting-project_at_gnosis_dot_cx>
Date: Sat Sep 13 2003 - 15:11:09 CDT

Please see:

    http://evm2003.sourceforge.net/architecture.html

I have updated the document to describe the XOR-with-repeated-ballot-id
obfuscation method, following the suggestions of Jan and Ed.

Btw. I endorse Jan's suggestion in a note a few moments ago that the
checksum in Code128 is proper and adequate error correction (at least
for the demo).

Also, pay attention to Jan's mention that we are using Code128's compact
representation of digits-only strings.

There's nothing much difficult about this, but start thinking in terms
of how the information from ballots can be represented as digits;
there's no need to be overly clever about how these digits are used,
we're really not tightly constrained. For example, it may be sensible
to represent a vote for the fifth candidate in the 3rd race as '0305'...
even if that does not maximize entropy in the vote encoding.

I'm a lot more concerned about having formats that are easy to debug
than I am about having ones at theoretical maxima.

Yours, David...

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Received on Tue Sep 30 23:17:04 2003

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