Initialize update always fail with error 0x6982

Question

My card was working fine but now everytime I call initialize update I get 0x6982, I have used the card multiple times with initialize update without External Authenticate command, each time I reset the card after Initialize update, yet now it is not work, does it mean that there is some blocking happened to the card because of the many Initialize update I have sent.

Answer 1

Hi,
This card is now locked and you will no longer be able to authenticate to the card manager. It is not the reseting of the card that resets the retry counter, it is a successful external authenticate that does this. This way an attacker cannot reset the retry counter when attempting to brute force the card keys.
If you are testing the INIT UPDATE and EXT AUTH steps, you should perform the INIT UPDATE once and record the data (host and card challenges etc) and keep working on this static data (without even having a card in the reader) and try to authenticate the card cryptogram received. Once you have the card cryptogram verified you should be able to execute EXT AUTH successfully.
Cheers,
Shane