NTAG 424 AuthenticationEV2 First NULL response

[shaghayeghnz]

Hi,

I am currently developing an application using Flutter to write to an NTAG424 DNA NFC tag; however, I am encountering some issues with the keys. The keys become unusable after a while, and I must switch to the other key to authenticate. For instance, I was using keyNo 0 to authenticate, but after a while, the response I receive from the NTAG is null, and I must authenticate with another key.

Best regards, Shaghayegh.

[KaiLi]

Hello @shaghayeghnz 

Since the reader you are using is not from NXP, it is hard to repeat your problem, I did the same test and everything working fine on my side. It is recommended that you refer to the description in section 6.14 of the following documentation to debug your device.

NTAG 424 DNA and NTAG 424 DNA TagTamper features and hints (nxp.com.cn)

and below is the part of the log for your reference:

BR

kelly