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Re: Dual method

Nicholas Bernstein wrote:

 The Ballot ID could be created as an MD-5 encryption of several
    data: polling place, choices, time-stamp (to the millisecond) and a
    random number. They would ensure uniqueness. Since the MD-5
    encryption is very hard to break (even if you know the algorithm)
    knowing just the ballot ID doesn't tell you anything about the data.

Overall your dual method seems to me to be a workable basis for open source development. I assume by "uniqueness" you include that a unique human voter is verified both with local registration records and with the voter signature private key, i.e the voter can prove to himself that the county verified the right voter and ballot.
I think it is more likely that NIST would recommend a flavor of SHA rather than MD5.

Lou