InterKosenCTF - [Crypto] Oh my Hash

oh-my-hash.py

# `dmin, cdmin, edmin, idmin, qdmin, Admin, !dmin
s = '''3dbd6c666db1e6ecbf391ff37622f30f
bdbd48266da0fee8dd190fe16e26f3cf
2d9f446765b1cefd95980fa35e32f24f
1dac5c6e7db1aee08d11a7e33c8ef15f
3d3d6c664d31fef8bd1d4ee36f32f3cf
3cbd4c662ca1eec8dd11afc35c0e634e
3db5c4626db3eef8151d0be37f27e347'''.splitlines()
s = [bin(int(c, 16))[2:].rjust(128, '0') for c in s]

res = ''
for i in range(128):
  cnt = 0
  for c in s:
    if c[i] == '0':
      cnt += 1
  res += '0' if cnt > 3 else '1'

print(hex(int(res, 2))[2:]) # => 出力された token をセットすると KOSENCTF{PADDING_MAKES_THIS_MORE_VULNERABLE}