Re:Our entire credit bureau system is broken
by AnthonyMouse on Monday September 11, 2017 @10:25AM
(#15218729)
> And there could be other usage of that card. Like if you make it a chip & pin so the card could become an unforgeable digital signature (physical signatures are absurdly unsecure too).
Digital signatures are this just as much as any other cryptography:
You can put a gun to someone's head and force them to sign something, or observe their PIN and borrow their card while they're not looking, and the signature will match. Which means it is no solution to the problem where you claim there is a valid signature and they claim it isn't legitimate and the signature can't tell you who is telling the truth.
Digital signatures are this just as much as any other cryptography:
https://xkcd.com/538/
You can put a gun to someone's head and force them to sign something, or observe their PIN and borrow their card while they're not looking, and the signature will match. Which means it is no solution to the problem where you claim there is a valid signature and they claim it isn't legitimate and the signature can't tell you who is telling the truth.