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/gist:600c3a19626b20999a8f30768076a52c

Created November 22, 2017 08:01
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gistfile1.txt
from Crypto.Util.number import *
size = 9
def detransform(byte,n):
a = (byte << n) % 512
b = byte >> (size - n)
return a | b
enc_flag = [361, 293, 84, 138, 197, 419, 189, 404, 216, 177, 383, 432, 344, 366, 87, 273, 419, 229, 254, 225, 349, 438, 140, 205, 107, 498, 163, 249, 206, 220, 105, 311, 315, 475, 44, 55, 355, 261, 434, 216, 249, 303, 60, 150, 493, 19, 291, 297, 184, 220, 206, 360, 303, 218, 301, 390, 343, 411, 420, 416, 70, 288, 400, 335]
flag = ''
for i in range(len(enc_flag) - 1):
enc_flag[i] = detransform(enc_flag[i],(i+3) % size )
enc_flag[i] = detransform(enc_flag[i],i % size)
flag+= bin(enc_flag[i])[2:].zfill(size)
print long_to_bytes(int(flag,2))
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