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How does PIN authentication work with contactless payments?
How does PIN authentication work with contactless payments? I figured I'd ask this here, because there are a bunch of very smart people on this sub. I couldn't find the answer by Googling, except for some very handwavy explanations. With chip & pin (not contactless), the chip signs the payment, its private key never leaves the chip, and it can't be read or copied. When you enter your pin on a terminal, t...
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