The things is 99.9% of entry cards (where I go away no less than) are default-encrypted mifare basic, making cloning trivial. These are basically a single antenna wired to an array of chips directed by a keypad. That seems viable on paper however you still get to carry the card and press the best swap.The ideal answer would be a smart ring with a reflashable NFC chip, along with a programmable MCU to implement the rolling logic between playing cards. Reflashing the NFC chip on the ring is a little bit of a ache (it takes a second, but if I must spend a second doing it every day, I might as properly get my keys out). Since each telephone has an NFC chip nowadays, although, cannot we use that to emulate all our Mifare cards? Mifare playing cards?Sadly, no.From my experience at least, most access cards are easy mifare basic playing cards, they usually have no payload: the reader just obtained an inventory of allowed card IDs, maintained by the constructing IT.While you'll be able to freely rewrite mifare information from Android, it will not let you alter your ID unless you root your telephone.
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