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Mike Graf
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XKCD has it wrong though, English words are about 0.6 bits per character of entropy. That gives about 15 bits of entropy ...
Why cant webapps just present a challenge on every page? Basically imagine if every request was a post and on the page there was a challenge, and you had to have the correct response in order for your IP to not get banned (or whatever). Just a thought.
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Feb 23, 2012