BoingBoing has a brief article up on Mitsubishi Pencil's anti-fraud hanko.
You'll recall from our earlier post that a hanko is a stamp used in Japan in lieu of a signature for legal documents. Even custom-made stamps can be forged, but this one uses a combination-lock to align markings on the stamp to a particular personal sequence, making it much easier to identify forged stamps after the fact, or to dispute documents signed with a stolen stamp.
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