mabel wrote:Hi!
For your requirement, you can change the GP authentication keys to protect your card from accessing by others. Check GP specification for the details of PUT KEY command.
These topics are similar with your issue. JFYI:
http://javacardos.com/javacardforum/vie ... p=370#p370
http://javacardos.com/javacardforum/vie ... f=20&t=135
Thanks so much @mabel. I will try that.