> I cannot mentally manage that many different pins. Pick 4 digits on the card, ... | Hacker News

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		cat199 on June 26, 2017 \| parent \| context \| favorite \| on: Ask HN: Why are credit card chip readers so slow? > I cannot mentally manage that many different pins. Pick 4 digits on the card, multiply/add them by some constant number you know. You're now done 'memorizing'.

digikata on June 26, 2017 [–]

Don't simple mnemonics have a risk of helping to reduce the search space to guess a pin?

stickfigure on June 26, 2017 | [–]

We're talking about a 4-digit search space. The system already needs (and presumably already has) extreme rate-limiting measures.

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