how i can lock a javacard with a secret key?

Question

I installed an applet on my javacard without any problem, the problem now is that anyone can delete this applet or install another applet,so I want to lock the card, how I can do this ?? thanks

score 2 · Answer 1 · answered Apr 29 '15 at 17:36

the problem now is that anyone can delete this applet or install another applet,so I want to lock the card

This is wrong! In the Locked life cycle state must of card's functions are disabled and you can't work with regular applets anymore. To aim your goal, you must change the authentication keys and keep the new keys safely in secret.

For changing the authentication keys, you can use GlobalPlatformPro tool as below:

gp -lock NewKey

Note that for the above command I assumed that your card keys are configured on default values now. If those are set on default value, the above command may break your card.

score 1 · Accepted Answer · answered Apr 29 '15 at 16:10

1

Like this:

https://github.com/martinpaljak/GlobalPlatformPro#lock--unlock-usage

And be sure to save the new key to somewhere safe.

answered Apr 29 '15 at 16:10

Martin Paljak

4,119
18
20

how i can lock a javacard with a secret key?

2 Answers2