svan70's bb_crackme#1
| Download bb_cme1.zip, 12 kb (password: crackmes.de) Browse contents of bb_cme1.zip Find please the correct code
Difficulty: 2 - Needs a little brain (or luck) | RatingWaiting for at least 3 votes View profile of svan70 » |
Solutions
Solution by baderj, published 09. sep, 2014; download (55 kb), password: crackmes.de or browse.
baderj has rated this crackme as awesome.
Discussion and comments
| cl0pen 25. Jun 2014 | Delete if this contains too much information. Is the encryption subroutine invertible? Since the overflow is discarded, I don't think there is a way to take the required output and go in reverse. |
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| cl0pen 28. Jun 2014 | Also, can I get a working serial for this crackme? I had a math friend of mine look at the encryption algorithm, but he thinks it's mathematically impossible to create a working serial. |
| svan70 Author 16. Jul 2014 | Thanks n0p[cc] for the solution. Is here anyone with better solution then brute force? It is possible. |
| n0p[cc] 31. Jul 2014 | I already described the mathematical solution in my solution. But I also uploaded/updated a new solution (waiting for approval) with an implementation of the mathematical solution with Square-and-Multiply. regards |
| baderj 03. Sep 2014 | Very good beginners crackme, highly recommend. The code can be found very elegantly indeed without brute forcing. |
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