Princeton’s Center for Information Technology Policy recently hosted a talk by Professor Juan Gilbert of the University of Florida, in which he demonstrated his interesting new invention and presented results from user studies. What’s the problem with ballot-marking devices? It’s well known that a voting system must use paper ballots to be trustworthy (at least […]

Preliminary unofficial election results posted at 4am after the November 3rd 2020 election, by election administrators in Antrim County Michigan, were incorrect by thousands of votes–in the Presidential race and in local races. Within days, Antrim County election administrators corrected the error, as confirmed by a full hand recount of the ballots, but everyone wondered: […]

Over the years I have written many articles about direct-recording electronic (DRE) voting machines, precinct-count optical-scan (PCOS) voting machines, ballot-marking devices (BMDs), and other 21st-century voting technology. But I haven’t written much about 20th-century lever machines; these machines were banned by the U.S. Congress in the Help America Vote Act and have not been used […]

By Andrew Appel and Susan Greenhalgh The accuracy of a voting machine is dependent on the software that runs it. If that software is corrupted or hacked, it can misreport the votes.  There is a common assumption that we can check the legitimacy of the software that is installed by checking a “hash code” and […]

Voters in Georgia polling places, 2020, used Ballot-Marking Devices (BMDs), touchscreen computers that print out paper ballots; then voters fed those ballots into Precinct-Count Optical Scan (PCOS) voting machines for tabulation. There were many allegations about hacking of Georgia’s Presidential election. Based on the statewide audit, we can know that the PCOS machines were not […]