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<article class="markdown-body entry-content container-lg" itemprop="text"><h1><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M7.775 3.275a.75.75 0 001.06 1.06l1.25-1.25a2 2 0 112.83 2.83l-2.5 2.5a2 2 0 01-2.83 0 .75.75 0 00-1.06 1.06 3.5 3.5 0 004.95 0l2.5-2.5a3.5 3.5 0 00-4.95-4.95l-1.25 1.25zm-4.69 9.64a2 2 0 010-2.83l2.5-2.5a2 2 0 012.83 0 .75.75 0 001.06-1.06 3.5 3.5 0 00-4.95 0l-2.5 2.5a3.5 3.5 0 004.95 4.95l1.25-1.25a.75.75 0 00-1.06-1.06l-1.25 1.25a2 2 0 01-2.83 0z"></path></svg>RTLXHA2021 - WWII Code?</h1>

Write-Up Author: RB916120 [MOCTF]

Flag:RTL{3nigm@_1s_th3_w@y_t0_g0}

<h2><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M7.775 3.275a.75.75 0 001.06 1.06l1.25-1.25a2 2 0 112.83 2.83l-2.5 2.5a2 2 0 01-2.83 0 .75.75 0 00-1.06 1.06 3.5 3.5 0 004.95 0l2.5-2.5a3.5 3.5 0 00-4.95-4.95l-1.25 1.25zm-4.69 9.64a2 2 0 010-2.83l2.5-2.5a2 2 0 012.83 0 .75.75 0 001.06-1.06 3.5 3.5 0 00-4.95 0l-2.5 2.5a3.5 3.5 0 004.95 4.95l1.25-1.25a.75.75 0 00-1.06-1.06l-1.25 1.25a2 2 0 01-2.83 0z"></path></svg>Question:</h2>

WWII Code?

Thehackerscrew are back! They have encrypted their message with a more advanced type of encryption.

We have intercepted this information in this specific order: Message: dvk{3ynxc@_1h_zd3_l@b_u0_u0} M3 UKW B VII 3 2 VII 16 3 VIII 6 3 eb ch af gd ij kp mn oz …

We have also found out that they have left out 4 plugboard partners. What does this mean? Can you solve this? Flag format is RTL{flag}
Author: RJCyber

</blockquote>
<h2><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M7.775 3.275a.75.75 0 001.06 1.06l1.25-1.25a2 2 0 112.83 2.83l-2.5 2.5a2 2 0 01-2.83 0 .75.75 0 00-1.06 1.06 3.5 3.5 0 004.95 0l2.5-2.5a3.5 3.5 0 00-4.95-4.95l-1.25 1.25zm-4.69 9.64a2 2 0 010-2.83l2.5-2.5a2 2 0 012.83 0 .75.75 0 001.06-1.06 3.5 3.5 0 00-4.95 0l-2.5 2.5a3.5 3.5 0 004.95 4.95l1.25-1.25a.75.75 0 00-1.06-1.06l-1.25 1.25a2 2 0 01-2.83 0z"></path></svg>Write up</h2>

the format of the cipher absolutely is enigma machine which is using by German in WII.

but the chall asking for the left out 4 plugboard partners.
so,below script would brute force each plugboard combination, there will many result returned with RTL.
this writeup just for record the way to bruteforce something for enigma machine.

<div class="highlight highlight-source-python position-relative overflow-auto" data-snippet-clipboard-copy-content="from enigma.machine import EnigmaMachine
from itertools import permutations
import string
"""
dvk{3ynxc@_1h_zd3_l@b_u0_u0} M3 UKW B VII 3 2 VII 16 3 VIII 6 3 eb ch af gd ij kp mn oz ...
https://www.cryptomuseum.com/crypto/enigma/wiring.htm

have to modify the plugboard.py MAX_PAIRS = 20 in python package

"""
cipher="dvk{3ynxc@_1h_zd3_l@b_u0_u0}".upper()
pb="eb ch af gd ij kp mn oz ".upper()

all=[]
word_list=""
for i in string.ascii_uppercase:
if i not in pb.replace(" ",""):
word_list=word_list+i

for i in permutations(word_list,8):
ppb=pb+i[0]+i[1]+" "+i[2]+i[3]+" "+i[4]+i[5]+" "+i[6]+i[7]

print(ppb.upper())
machine = EnigmaMachine.from_key_sheet(
rotors='VII VII VIII',
reflector='B',

# ring setting count from 0
ring_settings=[1,2,2],
plugboard_settings=ppb)

# set the init position of the ring
machine.set_display('CPF')

ans=""
for v in cipher:
if v.isalpha():
ans=ans+machine.process_text(v)
else:
ans=ans+v

print(ans)

if "RTL" in ans:
print("Plugboard is : "+ppb)
print("Flag: " + ans)
all.append(ans)

print("\n".join(all))
">

<span>from</span> <span>enigma</span>.<span>machine</span> <span>import</span> <span>EnigmaMachine</span>
<span>from</span> <span>itertools</span> <span>import</span> <span>permutations</span>
<span>import</span> <span>string</span>
<span>"""</span>
<span>dvk{3ynxc@_1h_zd3_l@b_u0_u0} M3 UKW B VII 3 2 VII 16 3 VIII 6 3 eb ch af gd ij kp mn oz ...</span>
<span>https://www.cryptomuseum.com/crypto/enigma/wiring.htm</span>
<span></span>
<span>have to modify the plugboard.py MAX_PAIRS = 20 in python package</span>
<span></span>
<span>"""</span>
<span>cipher</span><span>=</span><span>"dvk{3ynxc@_1h_zd3_l@b_u0_u0}"</span>.<span>upper</span>()
<span>pb</span><span>=</span><span>"eb ch af gd ij kp mn oz "</span>.<span>upper</span>()

<span>all</span><span>=</span>[]
<span>word_list</span><span>=</span><span>""</span>
<span>for</span> <span>i</span> <span>in</span> <span>string</span>.<span>ascii_uppercase</span>:
    <span>if</span> <span>i</span> <span>not</span> <span>in</span> <span>pb</span>.<span>replace</span>(<span>" "</span>,<span>""</span>):
        <span>word_list</span><span>=</span><span>word_list</span><span>+</span><span>i</span>

<span>for</span> <span>i</span> <span>in</span> <span>permutations</span>(<span>word_list</span>,<span>8</span>):
    <span>ppb</span><span>=</span><span>pb</span><span>+</span><span>i</span>[<span>0</span>]<span>+</span><span>i</span>[<span>1</span>]<span>+</span><span>" "</span><span>+</span><span>i</span>[<span>2</span>]<span>+</span><span>i</span>[<span>3</span>]<span>+</span><span>" "</span><span>+</span><span>i</span>[<span>4</span>]<span>+</span><span>i</span>[<span>5</span>]<span>+</span><span>" "</span><span>+</span><span>i</span>[<span>6</span>]<span>+</span><span>i</span>[<span>7</span>]

    <span>print</span>(<span>ppb</span>.<span>upper</span>()) 
    <span>machine</span> <span>=</span> <span>EnigmaMachine</span>.<span>from_key_sheet</span>(
    <span>rotors</span><span>=</span><span>'VII VII VIII'</span>,
    <span>reflector</span><span>=</span><span>'B'</span>,
    
    <span># ring setting count from 0</span>
    <span>ring_settings</span><span>=</span>[<span>1</span>,<span>2</span>,<span>2</span>],
    <span>plugboard_settings</span><span>=</span><span>ppb</span>)

    <span># set the init position of the ring</span>
    <span>machine</span>.<span>set_display</span>(<span>'CPF'</span>)

    <span>ans</span><span>=</span><span>""</span>   
    <span>for</span> <span>v</span> <span>in</span> <span>cipher</span>:
        <span>if</span> <span>v</span>.<span>isalpha</span>():
            <span>ans</span><span>=</span><span>ans</span><span>+</span><span>machine</span>.<span>process_text</span>(<span>v</span>)
        <span>else</span>:
            <span>ans</span><span>=</span><span>ans</span><span>+</span><span>v</span>

    <span>print</span>(<span>ans</span>)
 
    <span>if</span> <span>"RTL"</span> <span>in</span> <span>ans</span>:
        <span>print</span>(<span>"Plugboard is : "</span><span>+</span><span>ppb</span>)
        <span>print</span>(<span>"Flag: "</span> <span>+</span> <span>ans</span>)
        <span>all</span>.<span>append</span>(<span>ans</span>)

        
<span>print</span>(<span>"<span>\n</span>"</span>.<span>join</span>(<span>all</span>))

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<div id="ajax-error-message" class="ajax-error-message flash flash-error" hidden>
<svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-alert">
<path fill-rule="evenodd" d="M8.22 1.754a.25.25 0 00-.44 0L1.698 13.132a.25.25 0 00.22.368h12.164a.25.25 0 00.22-.368L8.22 1.754zm-1.763-.707c.659-1.234 2.427-1.234 3.086 0l6.082 11.378A1.75 1.75 0 0114.082 15H1.918a1.75 1.75 0 01-1.543-2.575L6.457 1.047zM9 11a1 1 0 11-2 0 1 1 0 012 0zm-.25-5.25a.75.75 0 00-1.5 0v2.5a.75.75 0 001.5 0v-2.5z"></path>
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<template id="site-details-dialog">
<details class="details-reset details-overlay details-overlay-dark lh-default color-fg-default hx_rsm" open>
<summary role="button" aria-label="Close dialog"></summary>
<details-dialog class="Box Box--overlay d-flex flex-column anim-fade-in fast hx_rsm-dialog hx_rsm-modal">
<button class="Box-btn-octicon m-0 btn-octicon position-absolute right-0 top-0" type="button" aria-label="Close dialog" data-close-dialog>
<svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x">
<path fill-rule="evenodd" d="M3.72 3.72a.75.75 0 011.06 0L8 6.94l3.22-3.22a.75.75 0 111.06 1.06L9.06 8l3.22 3.22a.75.75 0 11-1.06 1.06L8 9.06l-3.22 3.22a.75.75 0 01-1.06-1.06L6.94 8 3.72 4.78a.75.75 0 010-1.06z"></path>
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Original writeup (https://github.com/MOCSCTF/CTF-Write-UP/tree/master/Crypto/RTLXHA2021%20-%20WWII%20Code).

WWII Code?

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