Reply To: Sam Av2 ChangeKey

Forum MIFARE SmartCard IC`s Sam Av2 ChangeKey Reply To: Sam Av2 ChangeKey

Re: Sam Av2 ChangeKey

27. June 2019 at 10:31
Hi Marcelo,

If you have RFIDdiscover and the key change works, you can study how does it RFIDdiscover right. Did you consider all preconditions, e.g.: if you want to change a host key you must have a valid host authentication before etc.

SAM_ChangeKeyEntry is a complex command. The new key entry must be encrypted and a MAC must be calculated. If something went wrong, the SAM will reject the command. I recommend reading:

AN1823 – MIFARE SAM AV2 – Key Management and Personalization

You will find examples of SAM_ChangeKeyEntry there. This AN is available via our DocStore delivery.

Kind regards,
The TapLinx team
+ 0  |  - 0