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This was in the news in the last couple of days as there has been a claim that a program has been created which can crack captcha (the system where you have to type in words which have been distorted in order to prove you are a human) with 90% accuracy - Google apparently consider 1% accuracy to mean it's been cracked.
However, what interested me - something I didn't know and I think is some absolutely brilliant thinking, is that when you get the captcha that involves typing 2 separate words, only one of those words is known to the captcha program - the other word is scanned from books/magazines etc that are being digitized, but the computer can't recognise the word to digitise it. This word is sent, along with a known word and when someone uses the captcha system, if they have got the known word correct, the program assumes that the unknown word is also correct and sends this back to be used in the digitized book/magazine. In this way, the computer is using human intervention from millions of people to help with digitization, and we don't know we're doing it. It's not kept secret, it's just not well known.
Knowing this, it's almost tempting to type in something mischievous for one of the words (you never know which is which, but you have a 50/50 chance) to add it into digitized records π I assume that each word is probably checked more than once to stop people like me doing this though.
Thats interesting,
where did you find that out, I always assumed it was just random as thats how it seems.
What are you planning to do with this new found information, is there a plot to bring down google of facebook LOL
GTTS
Here's an good bit on it π
http://www.google.com/recaptcha/learnmore
Hmm - a plot to bring down facebook - now that's an idea π
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