"It's a cat-and-mouse that has no end, " says David Dagon, a professor of cyber security at Georgia Tech.

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Those tactics might not stop spammers altogether, Dagon says, but they could make Web services much harder to access with automated software.

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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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