Java Killswitch

Question

I've created a java application I'm selling for money, and the verification system involves using an unique HWID to ID the computer to see if they've paid. I was wondering if there was a way for a java application to "kill" itself, maybe deleting some of it's own class files, corrupting itself, or overriding itself.

Is there any way?

Answer 1

Make it web based, keep records in the database, make the user log in to use the system. Any dedicated cracker will defeat your system in a matter of time.

Answer 2

If this is a commercial grade app, then I would recommend using a security solution designed by professionals. Security and Cryptography is best left to experts

Layman solution : Could you execute a getmac (assuming this app runs out of windows) from within your system and do the check.? MAC ids are assumed to be unique for a PC. There are ways to override it but should address 90% of the cases.

Corrupting your app doesn't seem to be a good solution.