New voting machine employs cryptography and a bingo dauber

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Millions of Americans will cast votes today on machines that critics say are subject to malfunction and hacking.

Cryptographer David Chaum has invented a new voting system that he says provides citizens with proof their vote was properly counted. Chaum’s Punchscan combines elements of older-style paper ballots with an optical scanning machine. It allows voters to take a piece of the ballot home with them as a receipt. Punchscan has already been used to collect and tabulate votes in a student election on a college campus, and Chaum says it can work for other elections, too.

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