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Viewed 60k times. How does the bank know the code is genuine? Improve this question. DisgruntledGoat DisgruntledGoat 1 1 gold badge 4 4 silver badges 9 9 bronze badges. Do you put your card in it? Or there is a serial number on it you gave to the bank so they know what the PRNG is seeded to?
They look similar but work it different ways. Server runs same algorithm and verifies answers match. From the latter it seems to be generating codes depending on real time.
Add a comment. Active Oldest Votes. There are two standard ways to build such a device: Time-based. Improve this answer. The input x will progress in a defined way and produce modular output. Given appropriately large coefficients on each term, the cracking such a sequence becomes akin to a semiprime integer factorisation.
Furthermore, it allows the sequence to recover in cases where a large number of skipped entries are used, without resorting to brute-force. Polynomial, I confess you lost me. I hadn't heard of anything like that being used in this context, and I'm skeptical whether it would be secure, but I'll withhold judgement until I see the details.
Do you have a pointer to a more detailed explanation? I'm not familiar with that kind of thing used in this context, but I'd be interested to learn more if you can suggest any readings with more information. I don't have a direct reference to anything like that off the top of my head - the technique has a real name which eludes me at the moment. Think of its security model as an extension of RSA's - modular exponentiation of large values. The only major difference here is that a sequence is produced with properties that allow full coefficient recovery if you know a partial set of coefficients and a number of points on the curve.
Polynomial, if you are talking about secret sharing, I don't think it has any relevance here as far as I know. Are you sure it is used in this context? If you have any citations that indicate that secret sharing techniques are being used to generate the sequence of random values from hardware tokens, please do share the citation or pointer -- I'd be very interested -- but lacking that, I'm pretty skeptical.
It's definitely not 2, my accounts would have locked me out a long time ago if it was. Show 6 more comments. Moshe Katz 1, 1 1 gold badge 11 11 silver badges 17 17 bronze badges. Fearmonger Fearmonger 2 2 bronze badges. The link above does not work anymore.
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