I know that the question is a bit silly but I dont know how many keys can a MIFARE PLUS tag store in it.

Provided that I have a MIFARE PLUS S tag with 4k memory room and the key length is 128 bit, then the maximum amount of keys stored will be 31. (4000/128 = 31.25 rounded to 31)

It is correct ? The product leaflet doesn't tips how many keys are or if its is more then one.( I am assuming that its so)


  • $\begingroup$ Apart from being pure calculation unrelated to cryptography, you're probably confusing bits and bytes. $\endgroup$ – DannyNiu Jul 16 '19 at 1:28
  • $\begingroup$ Then it could have 250 AES128bit keys ? $\endgroup$ – user67441 Jul 18 '19 at 7:16
  • $\begingroup$ It could if it stores nothing other than keys. But anyway, you should contact MIFARE technical support for better info, we Crypto.SE is just a third party not having much to do with them. $\endgroup$ – DannyNiu Jul 18 '19 at 7:29

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