Reply To: Ntag 424DNA – authentication not possible

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Re: Ntag 424DNA – authentication not possible

5. March 2021 at 9:25

TapLinx Support
Dear Stephan,

These are application keys, which means they work on NDEF Application only and not on PICC level. This means that you need to select NDEF application before trying to Authenticate.

Try something like this:

`byte[] NTAG424DNA_NDEF_APP_NAME =
{(byte) 0xD2, (byte) 0x76, 0x00, 0x00, (byte) 0x85, 0x01, 0x01};

keyData.setKey(keyDefault);

/* this is a MUST */
ntag424DNA.isoSelectApplicationByDFName(NTAG424DNA_NDEF_APP_NAME);

ntag424DNA.authenticateEV2First(1, keyData, null);`

Best regards,
TapLinx team
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