Re: Security markings on the ballot

From: David Mertz <voting-project_at_gnosis_dot_cx>
Date: Thu Oct 23 2003 - 18:43:21 CDT

"Alan Dechert" <> wrote:
|> What I WOULD like to do, is use a placeholder for the actual
|> cryptographic signature during the demo. ........

|Couldn't the barcode serve this purpose? Right now, we are only using a
|visual obfuscation routine, but couldn't this include your cryptographic

Certainly the crypto code could be in the barcode (it would need to be
some extra bars, not simply the obfuscation method). I was suggesting
the actual printed code in order to DRAW attention to the fact it's
there. It encourages questions... to which we have good answers: "not
implemented in the demo, but we would use SHA, AES, key schedule blah,

I don't feel that strongly though about the barcode/visible numbers
thing... however, if it is a barcode, I'd like to have the security code
be visually seperated from the main barcode. It could just be a 1/2"
gap between the two, but something to indicate the different parts.

Btw. I'm convinced by Doug's elaboration of why he wants the official
logo too. Or at least close enough that I won't bother mentioning it
further. Since Alan proposed the idea too, that's a good mandate.

Yours, David...

P.S. contra Doug Jones, I don't think the security code has to be all
that long. Assuming there was a keyed cryptographic function involved
that made it unfeasable to produce a valid code without the key, six or
eight digits would be plenty. That gets us down to requiring the bad
guys to print 10^6-10^8 false ballots to produce a verifiable one. I'm
happy with that.

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Received on Fri Oct 31 23:17:04 2003

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