#1
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WebCops - THE uncrackable protection (?)
Hello!
LinkData offers a very hard to crack copy protection, e.g. used by Brockhaus Digital Enzyklopädie (see file below) or Hyperbowl (WinXP Plus Pack). It is used by high-quality software, and yet uncracked It uses a system similar to Microsofts activation since Windows XP: the software can be unlocked by phone or the internet. It works in the following way (when unlocking via phone): you say your authorization code, machine id, program id, and get an unlock code. As the authorization code is not entered into the program, it can't be checked, whether you have a guilty one. So JUST the unlock code has to be generated! Unfortunately I am not a big cracking expert. To get it to work, I wrote a brute forcer. It would be interesting to know, how many numbers (only numbers!) the unlock code consists of. The brute-forcer does 64 keys/s, so the right code would probably be found within less than 18 days IF it consits of 8 numbers Here is an example application protected by WebCops v1.51: http://eldorado.s4.cybton.com/data/brockhaus.rar Maybe here is an experienced cracker, who can proof, the this is NOT an unbeatable protection! |
#2
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"Unbeatable" protection
Hi,
Software protection is inherently flawed. With creative use of a dongle (i.e. irretrievable *hardware* public-key encryption of critical sections of code), it is possible to create a protection second-to-none - but even that is vulnerable to several 'man-in-the-middle' and reverse-engineering attacks. It may be computationally infeasible to break a particular protection, but impossibility is not guaranteed unless a problem is not merely NP-hard but NP-complete, and in the latter case, brute force is still possible. Software protection attempts to *minimize* the impact of users defrauding the business; at this, it is most successful in many instances. By the way: challenging someone to "crack this" seems more like a cheap attempt to have someone else work for you. -archaios |
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