Cracking a Software License Scheme
In his latest blog post, Andy Sloane issued a challenge to create a key-generator for his bespoke software licensing scheme.
Looking through his code, I quickly found that he was using RSA, and that valid keys decrypted to 12345678 under a hardcoded RSA public key.
In my response on the Reddit discussion, I explained creating a keygen was as simple as adding a multiple of his public-key modulus n to an existing key. Others quickly pointed out that it was trivial to factor n because it was not sufficiently large.
This is a great example of why creating secure systems is so hard: implementation mistakes are easy to make, and undermine the security of even the best cryptosystems.
Hello,
I wonder if you can help me crack a licence.lic file of a program. This program is a server program, and it uses the licence.lic to control expiration time and licenced party. I need to crack these two things. Of course, I will financially compensate your work.
If you are willing to help me, please reply me. Thanks!
Yours sincerely,
Kevi
1021992745@qq.com
hai,
i need help if you can crack soft license (license.lic) of program, may be same need with kevin,
please contact me by mail, if you are willing o help me.