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"DARPA hard" is shorthand for something considered [extremely] hard to achieve. The phrase comes from the US agency DARPA (Defense Advanced Research Projects Agency) who are often tasked with coming up with solutions to very difficult problems (e.g. coming up with stealth [technology] to prevent aircraft being shot down). The [implication] is that only resources of the scale available to DARPA's would be required to crack the problem.
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