topic Re: Change key for the NTAG 424 DNA in NFC

Change key for the NTAG 424 DNA

shaghayeghnz — Sun, 22 Oct 2023 12:53:39 GMT

Hi,

I'm currently experiencing some issues with changing the key for the NTAG 424 DNA. According to the document at https://www.nxp.com/docs/en/application-note/AN12196.pdf, specifically in section 6.16.2, if I authenticate with keyNo 01, I should be able to change keyNo 01. However, when I run the command, I receive the response 91AEh, which, according to the document at https://www.nxp.com/docs/en/data-sheet/NT4H2421Gx.pdf, means "At the application level, missing active authentication with the AppMasterKey while targeting any AppKey."

BR, Shaghayegh.

Re: Change key for the NTAG 424 DNA

KaiLi — Mon, 23 Oct 2023 09:24:52 GMT

Hello @shaghayeghnz

Yes, you're right. Once you authenticate with keyNo 01, and then keyNo 01 can be changed by ChangeKey command. The below test log for your reference.

kelly

Re: Change key for the NTAG 424 DNA

GlennN — Tue, 31 Oct 2023 10:56:14 GMT

Hi, This reply does not really answer the question, shaghayeghnz wants to change the key data not change which key is to be used. I am also trying to do this and cannot get it to work with TagXplorer.

My problem is similar but not identical (https://community.nxp.com/t5/NFC/NTAG424-ChangeKey-not-working-in-TagXplorer/m-p/1748722/emcs_t/S2h8ZW1haWx8dG9waWNfc3Vic2NyaXB0aW9ufExPQ1dIOE5BQzJIUU5KfDE3NDg3MjJ8U1VCU0NSSVBUSU9OU3xoSw#M10920)

I am sure we would both be grateful for any help

Re: Change key for the NTAG 424 DNA

KaiLi — Wed, 01 Nov 2023 01:54:34 GMT

Hello @GlennN

Please take a closer look. The key has also been changed. In my test example, the values of key4 and key5 are different.

kelly

Re: Change key for the NTAG 424 DNA

GlennN — Wed, 01 Nov 2023 09:24:08 GMT

@KaiLiYes, sorry, I had missed the change of value in Key 5