MR.HAANDI's WeakAES 2
| Download weakaes2_keygenme.zip, 8 kb (password: crackmes.de) Browse contents of weakaes2_keygenme.zip This is a non-standard AES implementation containing an algorithmic backdoor. Spot it and use some math.
Difficulty: 5 - Professional problem to solve | RatingWaiting for at least 3 votes View profile of MR.HAANDI » |
Solutions
Solution by Dcoder, published 21. nov, 2013; download (304 kb), password: crackmes.de or browse.
Dcoder has rated this crackme as quite nice.
Discussion and comments
| MR.HAANDI Author 21. Nov 2013 | @Dcoder: Nice solution. You weren't tricked by the "non-linearity" and have chosen the fastest of the "multiple ways to generate valid signatures". I would have preferred to see a slow solution, which treats the SBox as a non-linear transformation and uses the chinese remainder theorem, but you did not give other students any chance :) Still, maybe someone else wants to document the non-linear way in their own solution. The keygenme is built in a way that it is perfectly possible. |
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| tamaroth Moderator 22. Nov 2013 | I'll give it a shot at some point. But first I need to understand how exactly AES works :) |
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