Exploiting flaws

Technology Review: Fingerprinting Computer Chips
“The security of Verayo’s chips relies on the fact that no two chips are exactly alike. The components of a computer circuit are measured in billionths of a meter. So a stray atom here or there during manufacturing can cause a wire to turn out slightly thicker or thinner than the specs call for. That leads to miniscule variations in how fast the circuit works, and there’s nothing that can be done to prevent it. […] A signal traveling through a simple circuit will go faster or slower depending on these physical variations. By sending a series of signals through, and measuring how fast they travel, he can generate a string of numbers unique to each circuit. This has been dubbed a “physical unclonable function”–PUF for short. ”
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