Secure auth with dumb chips, secret outside of NDEF (xSIID?)

@Yeka,
I think your topic and the replies are too good and valuable info to loose in the anti-derailment thread.

I have moved it here, to its own thread.
the title is just a place holder.
feel free to change it (if you can, or let me know if you can’t and I can change it for you)

I was wondering the same/similar thing the other day when I saw Amals xSIID red white and blue sale…

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