We are given a file, hack.py, which looks as follows.

from Crypto.Util.number import *
from hashlib import md5

flag = "XXX"
assert len(flag) == 4
pad = bytes_to_long(md5(flag).digest())

hack = 0

for char in flag:
    hack+= pad
    hack*= ord(char)

print hack
print pad
print hack % pad
#hack …

TL;DR: There's a problem in my filesystem and it made my important file corrupted.

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