NSA chief defends surveillance programs

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National Security Agency Director Keith Alexander jousted with a few hecklers as he defended the US spy agency’s surveillance programs at the Black Hat security conference on Wednesday, but largely kept the crowd of cybersecurity experts and hackers on his side.

“Read the Constitution!” one heckler shouted at the 61-year-old four-star general as he responded to polite but tough questions selected in advance by conference organizers.

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