FAQ # 31

From: Popkin, Laird (WMG Corp) <"Popkin,>
Date: Tue Dec 16 2003 - 16:07:49 CST

Looks like we have FAQ # 31: "What's in the bar code?"

Point of clarification: the "116 bit number" is really however many bits is
required to encode the votes for a particular ballot, right? So if there are
fewer things to vote on, or fewer options, it would be shorter, and vice

- LP
-----Original Message-----
From: owner-voting-project@afterburner.sonic.net
[mailto:owner-voting-project@afterburner.sonic.net]On Behalf Of Alan
Sent: Tuesday, December 16, 2003 4:05 PM
To: voting-project@lists.sonic.net
Subject: Re: [voting-project] FAQ # 25

> > Makes sense. Is there a spec somewhere for how the vote is encoded
> > into the barcode?
> I think Alan produced a pretty good description on the list.
Well, I wrote this in response to a similar question from Karl:


> Basically, each bubble on the ballot is represented by one bit (this is
> not maximally concise, of course). Then that 116-bit number is
> converted to a 40-digit decimal number (I guess that's how the size
> works out). ......
Minor detail: the 116-bit number is converted to a 36 digit number.
Actually, it only takes 35 decimal digits maximum to convert the 116-bit
number but we have to add a leading zero because Character set C of Code 128
barcode encodes only pairs of digits.

The other 4 digits you are thinking of is the ballot ID.


Alan D.

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Received on Wed Dec 31 23:17:13 2003

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