The Navy Bought Fake Trojanized Chinese Microchips. They weren't only low-quality fakes, they had been made with a "back-door" and could have been remotely shut down at any time. If left undiscovered the result could have rendered useless U.S. missiles and killed the signal from aircraft that tells everyone whether it's friend or foe.
The problem remains with these "trojan-horse" circuits that can be built into the chip and are almost impossible to detect -- especially without the original plans to compare them to.
The Intelligence Advanced Research Projects Agency (IARPA) is now looking for ways to check the chips to make sure they haven't been hacked in the production process.
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