Hi all,
i'm facing a strange behaviour that i can't solve. I completed all my steps to configure a #NTAG424 for a security platform: everything is ok BUT one last thing
I had to change all the 5 keys and started with this "loop" for 4 to 0:
Login with key 0
Change key X
I'm aware that changing K0 is different from K4-1 and the response is 91-00 so seems everything is correct.
Now the problem: i can login with all the kyes 4-1 but with K0 i get a 91-AE in login part 2.
I suppose that the encryption is wrong so the key is different from what i think, but i checked a lot of time the code and is ok. I only changet the cryptogram calculation as per data sheet and AN12196.
Any hint?
Thank
Have you already implemented ChangeKey 0 and 1-4 in your post? I am currently implementing this, but I have encountered some issues. I am unable to successfully modify Key1-4 to respond to 911E, and after modifying Key0, the authentication response is 91AE. I would like to seek some help from you, and I would greatly appreciate it.
Hello @KaiLi
I didn't see 6.16.2 in AN12196. Is it because the version of the document is different?
Any hints？
Thank you!
Hello @MPucci
Thanks for contacting us and based on your issue description, it's recommended that you try the steps of chapter 6.16.2 of AN12196. For example:
1. Authentication by keyNo 0x00
2. input the New key
3. execute ChangeKey command
4. double check using the new key to authenticate NTAG424.
BR
Kelly
Some more info: i know is not correct but i use the same RndA in all login before change the keys. I can't identify the root of the issue, but if i use 5 different RndA in login, no problems with keys (even K0), if i use the same RndA in login, K0 is corrupted.
So for now the problem is solved, without knowing the cause.