nice geeky captchas
If you are good at math, you wont have problems signing in at the Ruđer Bošković Institute Quantum Random Bit Generator.
CAPTCHA = Completely Automated Public Turing test to tell Computers and Humans Apart
geschonneck.com
This is the private security page of Alexander Geschonneck (Berlin, Germany).
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© 1995-2010 Alexander Geschonneck.
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