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Interesting, thanks. However, I wonder why ID cards are affected at all. Aren't the private keys/certificates usually generated centrally on dedicated govt hardware and only the public keys are programmed into the cards? Do the cards still generate some keys on their own?
The whole point of using smartcards is that you generate the keys internally (and they never leave the card), then the govt signs the public key (presumably with some channel attestation involved so the card can prove it's a real card issued originally by govt).
hm, looks like it. Here's how it works (worked?) for Belgian IDs, which also has (had?) Infineon chip: https://homes.esat.kuleuven.be/~decockd/slides/2006.10.09.belgian.eid.card.technical.overview.presentation.pdf …pic.twitter.com/iqupy8Qgzx
@doegox do you know if current eID cards still use Infineon chips?
Makes me wonder if there's some way to tell if a cert was generated on card, or imported from elsewhere.
There is; public keys can be trivially checked for the ROCA fingerprint in microseconds. If you mean in a more general case, usually what happens is cards are provisioned with a private key at manufacture time that signs things to prove they're card-generated.
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