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Article: Why Are Bots Unable to Check "I Am Not a Robot" Checkboxes?

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http://mentalfloss.com/article/575112/why-are-bots-unable-check-i-am-not-robot-checkboxes

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How complicated can one little checkbox be? You can't even imagine!
 
For starters, Google invented an entire virtual machine—essentially a simulated computer inside a computer—just to run that checkbox.
 
That virtual machine uses Google's own language, which they then encrypt. Twice.
 
But this is no simple encryption. Normally, when you password protect something, you might use a key to decode it. Google’s invented language is decoded with a key that is changed by the process of reading the language, and the language also changes as it is read.
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