RE: How can I complain to who cracked my program?

["David Gillett" <gillettdavid () fhda edu>]

-----Original Message-----
From: Paul Johnston [mailto:paul.johnston () pentest co uk]

> But it's not always possible to write a keygen. For example, if the keygen
needs the private key, and the
> software only contains the public key needed to verify it, reverse
engineering will not allow you to create a
> keygen. Sure, you could created cracked software that didn't try to
validate the key, but that's not quite the
> same.

  Almost right.

  IF the software uses a public-key cryptographic scheme to verify the
serial number, then writing a keygen is equivalent to retrieving the private
key.  Ideally this is prohibitively expensive and so impractical, but
"impractical" is fundamentally different from "impossible".  And
implementation errors, application errors (well-implemented crypto applied
incorrectly), or advances in the art (new flaws found in algorithms believed
secure) may all dramatically reduce the resources needed.

  Strong crypto, well-implemented and used correctly, should make writing a
keygen impractical, which suggests that the application in question fell
short on one or more of these criteria.  That's not a defense of the author
of this keygen, but it may help avoid repetition of whatever errors were
made in future versions or projects.

David Gillett, CISSP



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