Scantegrity - Method

Method

The Scantegrity II voting procedure is similar to that of a traditional optical scan voting system, except that each voting response location contains a random confirmation code printed in invisible ink. The voter marks the location using a specially provided "decoder" pen, which activates the invisible ink causing it to darken, revealing a confirmation code.

Voters wishing to verify that their vote is unmodified may write down the confirmation codes for each race on a detachable chit that contains the ballot's serial number. Otherwise, the voter can simply ignore the code and continue to mark and cast their ballot as normal.

The confirmation codes are randomly assigned to the ballots, allowing voters to freely share their codes while keeping their votes secret. The codes are also pre-committed to a committee of mutually-distrustful entities (such as representatives of each political party) so that the confirmation codes cannot be changed or misprinted without detection. Voters may request additional ballots to audit—they ensure the ballots are properly printed by revealing all the codes and comparing these to the codes committed to.

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