cyph20

Actually those variables were on NVM so DESELECT/RESET should not affect them at any point. Yes I understand it is difficult to guess the cause without looking at the implementation.

BACKGROUND: I'm working with NXP JCOP4 based cards on a custom applet. At two separate instances I faced that value of a certain variable got reset (I can tell the exact value for only instance and that...

The applet basically supports storing of private data and provide mechanism to store/access/delete over secure channel.

No, it does not involve payment. The JCOP config is for ID (no payment support) Yes, keys & its components are unique for every card. yes, that is already decided (i'm using T=1 only)

I'm working on a custom applet for GP spec card (JCOP4 based card from NXP). I want to know what things should be taken care of before sending the cards to end-users. Things that I'm already aware of -...