Someone may tell you how to get a "free" black key to open HISEC boxes. They may say its a bug Nexon hasn't fixed yet. Or you might see a forum post like this: Hello everyone. There is a bug in Combat Arms that lets people get black keys without paying NX or GP...
Nexon, please fix the bug!! I see noobs running around with many items that they shouldn't have and the message boxes are being spammed with people getting items
How to duplicate bug (- do not do this if you are not an admin, it's against the rules):
1 Visit website through [website omitted]
2 Clicking the "Store" tab.
3 Going to the black key page.
4 Going into the user inventory in Combat Arms and the black key is now in the inventory.
NEXON PLEASE FIX!!
DON'T GO THERE! Here's why:
This is a link with a .tk extension. Look up what .tk extensions are. They can rename any domain to what you want (.tk), which means this could be any site. No one should type there login info there, it is not going to Nexon, it's going to who-knows-where.
If you logged in with your Nexon info then I suggest you change your password ASAP.
If there is a ".tk" any where in a link it's better to be safe than sorry and not click it.