Pramana, like any CAPTCHA, will likely remain vulnerable to teams of humans paid small amounts to crack the tests.

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Another key element to Pramana's approach is secretly cycling through changes in the criteria to keep spammers from cracking the code.

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The company Sehgal founded a year ago, Pramana, takes a different approach.

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Pramana, which means "proof of reality" in Hindi, is currently in "stealth" mode, and won't reveal much about its customers or just how it works.

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David Dagon, a professor of cybersecurity at Georgia Tech who's familiar with Pramana, hints that the technology may involve tracking mouse movements for signs of human timing.

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But with Pramana's system in place, spammers would have to pay humans to complete every element of the registration--if a bot took over at any point, the spammer would be revealed.

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