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http://arstechnica.com/news.ars/post/20080208-researchers-use-lego-mindstorm-robot-to-improve-atm-security.html
From the article:
"When the researchers created their prototype, which is called Undercover and
was built with a Lego Mindstorms robot, they attempted to come up with a system
that would be easy to use but would limit vulnerability to common attacks.
Unlike many conventional security systems which use some kind of secret response
like a password, the Undercover system partially obfuscates the query instead.
The Undercover system does this by making the query use both visual cues from
images and tactile cues which are provided by a rotating and vibrating ball that
the user covers with their hand."
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