Re: Alternatives to a single bar code

From: Arthur Keller <arthur_at_kellers_dot_org>
Date: Wed May 05 2004 - 11:30:53 CDT

At 3:04 AM -0700 5/5/04, Steve Chessin wrote:
> >This is why I prefer one bar code that contains all the data (that bar
>>code would be replicated for protection against damage, but it would be
>>the same bar code.)
>>I don't see any hope that we will be able to stay within the data limits
>>of the 1 dimensional bar codes - we are already pushing the limit, even
>>without a digital signature message digest or end-to-end check-code. But
>>the 2-D codes (e.g. PDF417) can hold about 2kbytes - about 50 to 100
>>times what we are getting out of the current 1D EAN128C bar code. The
>>price for a usable 1D handheld scanner is roughly $150, a 2D model costs
>>about $50 more.
>How many choices can that 2K hold?

That's a real good question. How big is a DSS message digest? How
big is an end-to-end check-code? Please note that there have been
suggestions of digitally signing ballots with both a hardware key and
either a software-generated key or the CD's key.

Best regards,

Arthur M. Keller, Ph.D., 3881 Corina Way, Palo Alto, CA  94303-4507
tel +1(650)424-0202, fax +1(650)424-0424
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Received on Mon May 31 23:17:15 2004

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