decode.py

#!/usr/bin/env python3

import base64

expected = "81h4ck891h4ck931h4ck3l1h4ckl81h4ck821h4ck2j1h4ckj81h4ck811h4ck1y1h4cky81h4ck801h4ck061h4ck671h4ck791h4ck951h4ck571h4ck781h4ck8y1h4cky71h4ck771h4ck761h4ck671h4ck761h4ck6y1h4cky71h4ck751h4ck5t1h4ckt71h4ck741h4ck4h1h4ckh71h4ck731h4ck3d1h4ckd71h4ck721h4ck2f1h4ckf71h4ck711h4ck1g1h4ckg71h4ck701h4ck0f1h4ckf61h4ck691h4ck9g1h4ckg61h4ck681h4ck8f1h4ckf61h4ck671h4ck7d1h4ckd61h4ck661h4ck6f1h4ckf61h4ck651h4ck551h4ck561h4ck641h4ck441h4ck461h4ck631h4ck331h4ck361h4ck621h4ck241h4ck461h4ck611h4ck131h4ck361h4ck601h4ck051h4ck551h4ck591h4ck9=1h4ck=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"

def rev_mikeswift(expected):
    ret = []
    delim = 'h4ck'
    expected = expected.split(delim)
    for e in expected[1:]:
        ret.append(e[0])

    return ''.join(ret)

def rev_crypt(expected):
    ret = []
    fusc = '893'
    expected = expected[len(fusc):]
    i = 0
    j = i
    k = 82
    while i < len(expected):
        j = expected.find(str(k), i)
        ret.append(expected[i:j])
        i = j + len(str(k))
        k -= 1

    ret.reverse()
    return ''.join(ret)

def rev_obfuscate(expected):
    fusc = "florSFIUEfet4565477"
    i = expected.find(fusc)
    expected = expected[i+len(fusc):]
    fusc = "534345fdfgfgfdhty6y56yjl"
    i = expected.find(fusc)
    expected = expected[:i]
    return base64.b64decode(expected)

ski = rev_mikeswift(expected)
print('>', ski)
ski = rev_crypt(ski)
print('>', ski)
ski = rev_obfuscate(ski)
print('>', ski)
# cyber{Fl4g_b4ckw4rds_15_g4lF}