crypto_machine_02.txt

From GlacierSG via discord:

#!/usr/bin/python2

import sys, binascii, base64, string, random


def H_r(m):
    return binascii.unhexlify(m)

def B_r(m):
    return base64.b64decode(m)

def R_r(m):
    t = string.maketrans(
        "NOPQRSTUVWXYZABCDEFGHIJKLMnopqrstuvwxyzabcdefghijklm#",
        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz:")
    return string.translate(m,t)

def X_r(m):
    m = H_r(m)
    return (''.join(chr(ord(c)^0x42) for c in m))

f = [ X_r, B_r, R_r ]

enc = open("MESSAGE", "rb").read().split(':')
while True:
    s = ''
    for i in range(3):
        s += (f[int(enc[i][0])](enc[i][1:]))
    if 'flag' in s:
        print(s)
        break
    enc = s.split(':')