Why DESFire card replied 8-byte random number

[F_ZH]

Hi there,

I tried to read DESFire 8 bytes of plain data, why did I get a reply with 8 bytes of extra random numbers? Is it CMAC?

Kind regards,

F_ZH

[jimmychan]

Hello,

The details are in the document of Desfire.

Please download the document from the Mifare Desfire web page. The document is under the "Secure".

MIFARE DESFire EV3 | Secure, Contactless IC | NXP Semiconductors