Can anyone please suggest a free license key generator and corresponding API
in Java ? Thanks a lot in advance.
JCE.
Basically all you need is to digitally sign the information about a
customer you want burned in to customise a program and then check the
digital signature. Keep in mind the way to bypass your security is
not to crack the encryption but simply to remove the signature
verification check.
A more sophisticated method is to encrypt the burned in customer data.
Then the program decrypts it and uses it. This is only mildly harder
to crack since the program must contain the key. You simply stop the
program at the point it has decrypted the data, make a copy of it, and
then patch the program to use that unencrypted data rather than
fetching it from the encrypted version.
To make a program that will drive hackers insane is an art. I give
some hints at how in my obfuscator essay. You can't do it with a
simple little package add-on. That just stops "honest" folk -- those
too lazy to try to crack your restriction.
see
http://mindprod.com/jgloss/encryption.html
http://mindprod.com/jgloss/cryptography.html
http://mindprod.com/jgloss/jce.html
http://mindprod.com/jgloss/digitalsignatures.html
http://mindprod.com/jgloss/obfuscator.html
