The issues is 99.9% of entry cards (the place I go away at the least) are default-encrypted mifare basic, making cloning trivial. These are mainly a single antenna wired to an array of chips directed by a keypad. That seems viable on paper but you still get to hold the card and press the proper change.The perfect solution would be a smart ring with a reflashable NFC chip, together with a programmable MCU to implement the rolling logic between playing cards. Reflashing the NFC chip on the ring is a bit of a pain (it takes a second, but if I must spend a second doing it day-after-day, I'd as well get my keys out). Since every telephone has an NFC chip these days, although, can't we use that to emulate all our Mifare cards? Mifare cards?Unfortunately, no.From my experience no less than, most access playing cards are easy mifare basic playing cards, and so they don't have any payload: the reader simply acquired a listing of allowed card IDs, maintained by the constructing IT.Whereas you may freely rewrite mifare data from Android, it will not let you modify your ID except you root your cellphone.
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