MR.HAANDI's WeakAES
| Download weakaes_keygenme.zip, 9 kb (password: crackmes.de) Browse contents of weakaes_keygenme.zip This is a non-standard AES implementation containing an algorithmic backdoor. Spot it and use some math.
Difficulty: 4 - Needs special knowledge | Send a message to MR.HAANDI » View profile of MR.HAANDI » |
Solutions
Solution by Dcoder, published 17. jul, 2012; download (412 kb), password: crackmes.de or browse.
Dcoder has rated this crackme as quite nice.
Discussion and comments
| MR.HAANDI Author 17. Jul 2012 | Nice solution Dcoder, that is exactly how I intended this to be solved. However, there is a backdoor to the backdoor. As soon as you know that the function is linear i.e. y = Ax + Bk + c (y: cipher, x: plain, k: key) you can just sample it with unit vectors and 0, invert B and you're done. |
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