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from Crypto.Cipher import AES | |
import base64 | |
import hashlib | |
from tqdm import tqdm | |
def main(): | |
c = base64.b64decode('FEAjLtaf9bQ7oJCY53mV3IJOWDVi7donm6KEb9yjsxkCjuz0gpluD1vczeQGb8Pg') | |
for k in tqdm(range(2**32)): | |
key = (str(k).encode() + b'\0'*16)[:16] | |
cipher = AES.new(key, AES.MODE_ECB) | |
m = cipher.decrypt(c) | |
if b'kurenaifCTF' not in m: continue | |
print(k, m) | |
# kurenaifCTF{twice_reloaded_mersenne_twister} | |
if __name__ == '__main__': | |
main() | |
''' | |
key | |
The passphrase. If the passphrase is shorted than expected, it is silently padded with NUL characters; if the passphrase is longer than expected, it is silently truncated. | |
''' | |
''' | |
❯ pypy3 05-three-values-twister.py | |
7%|█▌ | 296322353/4294967296 [21:45<5:47:51, 191583.84it/s] | |
296332286 b'kurenaifCTF{twice_reloaded_mersenne_twister}\x04\x04\x04\x04' | |
8%|█▊ | 346303052/4294967296 [25:44<4:18:03, 255016.83it/s] | |
''' |
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