topic Re: NTAG 424 Tamper encryption in NFC

NTAG 424 Tamper encryption

MPucci — Sat, 17 Aug 2024 19:08:52 GMT

Hi,

need help with NTAG424 TT: enabling tamper function with key 0 (or 1,2,3,4 doesn't care) using SetConfiguration option 07 i get 9100 as response so seems everyting ok. But in the NDEF message the mirroring of TT is always in clear as the key remains at E as the default value.

I tried with my Python app and with TagExplore, result is the same.

Any hint?

Mario

Re: NTAG 424 Tamper encryption

danielchen — Wed, 21 Aug 2024 12:40:02 GMT

could you please let me know your detail steps, so I can reproduce your issue on my side with RFIDDiscover?

Regards

Daniel

Re: NTAG 424 Tamper encryption

MPucci — Wed, 21 Aug 2024 17:26:52 GMT

Thanks Daniel,

reading better the datasheet, TTStatuskey is not used to encrypt the tamper status in NDEF but as authentication to issue the GetTTStatus command. Unfortunately i dont' find how to encrypt TTStatus in NDEF: i red on AN12196 that is possible using the EncData but don't know how. Moreover fig. 3 and 4 at page 9 show the encryption of TTStatus OR Static data, i'd like to have both if possible

Thanks,

Mario

Re: NTAG 424 Tamper encryption

MPucci — Thu, 22 Aug 2024 17:15:11 GMT

Thanks Daniel,

with several try and fix i managed to have the TTStatus encrypted in NDEF.

Mario

Re: NTAG 424 Tamper encryption

Plkron — Mon, 16 Sep 2024 13:25:47 GMT

Im having the same problem! Can you help me? How did you solve it??