-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy paththe_two_columns.html
230 lines (186 loc) · 12.9 KB
/
the_two_columns.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
<!DOCTYPE HTML>
<html lang="en" class="sidebar-visible no-js light">
<head>
<!-- Book generated using mdBook -->
<meta charset="UTF-8">
<title>The Two Columns - ctfZero_writeup</title>
<!-- Custom HTML head -->
<meta name="description" content="">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="theme-color" content="#ffffff" />
<link rel="icon" href="favicon.svg">
<link rel="shortcut icon" href="favicon.png">
<link rel="stylesheet" href="css/variables.css">
<link rel="stylesheet" href="css/general.css">
<link rel="stylesheet" href="css/chrome.css">
<link rel="stylesheet" href="css/print.css" media="print">
<!-- Fonts -->
<link rel="stylesheet" href="FontAwesome/css/font-awesome.css">
<link rel="stylesheet" href="fonts/fonts.css">
<!-- Highlight.js Stylesheets -->
<link rel="stylesheet" href="highlight.css">
<link rel="stylesheet" href="tomorrow-night.css">
<link rel="stylesheet" href="ayu-highlight.css">
<!-- Custom theme stylesheets -->
</head>
<body>
<div id="body-container">
<!-- Provide site root to javascript -->
<script>
var path_to_root = "";
var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "navy" : "light";
</script>
<!-- Work around some values being stored in localStorage wrapped in quotes -->
<script>
try {
var theme = localStorage.getItem('mdbook-theme');
var sidebar = localStorage.getItem('mdbook-sidebar');
if (theme.startsWith('"') && theme.endsWith('"')) {
localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1));
}
if (sidebar.startsWith('"') && sidebar.endsWith('"')) {
localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1));
}
} catch (e) { }
</script>
<!-- Set the theme before any content is loaded, prevents flash -->
<script>
var theme;
try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
if (theme === null || theme === undefined) { theme = default_theme; }
var html = document.querySelector('html');
html.classList.remove('no-js')
html.classList.remove('light')
html.classList.add(theme);
html.classList.add('js');
</script>
<!-- Hide / unhide sidebar before it is displayed -->
<script>
var html = document.querySelector('html');
var sidebar = null;
if (document.body.clientWidth >= 1080) {
try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
sidebar = sidebar || 'visible';
} else {
sidebar = 'hidden';
}
html.classList.remove('sidebar-visible');
html.classList.add("sidebar-" + sidebar);
</script>
<nav id="sidebar" class="sidebar" aria-label="Table of contents">
<div class="sidebar-scrollbox">
<ol class="chapter"><li class="chapter-item expanded "><a href="index.html"><strong aria-hidden="true">1.</strong> index</a></li><li class="chapter-item expanded affix "><li class="part-title">Cryptography</li><li class="chapter-item expanded "><a href="caesar_salad.html"><strong aria-hidden="true">2.</strong> Caesar Salad</a></li><li class="chapter-item expanded "><a href="xor_everything.html"><strong aria-hidden="true">3.</strong> XOR everything, shouldn't you?</a></li><li class="chapter-item expanded "><a href="im_committed.html"><strong aria-hidden="true">4.</strong> I'm committed, or am I?</a></li><li class="chapter-item expanded "><a href="ascii_wonders.html"><strong aria-hidden="true">5.</strong> ASCII Wonders!</a></li><li class="chapter-item expanded "><a href="xor_encryption.html"><strong aria-hidden="true">6.</strong> XOR Encryption</a></li><li class="chapter-item expanded "><a href="the_two_columns.html" class="active"><strong aria-hidden="true">7.</strong> The Two Columns</a></li><li class="chapter-item expanded "><a href="a_different_one.html"><strong aria-hidden="true">8.</strong> A different one</a></li><li class="chapter-item expanded "><a href="a_tough_nut.html"><strong aria-hidden="true">9.</strong> A tough nut</a></li><li class="chapter-item expanded affix "><li class="part-title">Forensics</li><li class="chapter-item expanded "><a href="random_file.html"><strong aria-hidden="true">10.</strong> Random file</a></li><li class="chapter-item expanded "><a href="jpeg_image.html"><strong aria-hidden="true">11.</strong> JPEG Image</a></li><li class="chapter-item expanded "><a href="file_size.html"><strong aria-hidden="true">12.</strong> File Size</a></li><li class="chapter-item expanded "><a href="really_a_text_file.html"><strong aria-hidden="true">13.</strong> Really a Text File?</a></li><li class="chapter-item expanded "><a href="qr_mania.html"><strong aria-hidden="true">14.</strong> QR Mania</a></li><li class="chapter-item expanded affix "><li class="part-title">Misc</li><li class="chapter-item expanded "><a href="atm.html"><strong aria-hidden="true">15.</strong> ATM</a></li><li class="chapter-item expanded "><a href="beat_the_system.html"><strong aria-hidden="true">16.</strong> Beat the System</a></li><li class="chapter-item expanded affix "><li class="part-title">Web Exp</li><li class="chapter-item expanded "><a href="chall_1.html"><strong aria-hidden="true">17.</strong> Challenge 1</a></li><li class="chapter-item expanded "><a href="chall_2.html"><strong aria-hidden="true">18.</strong> Challenge 2</a></li><li class="chapter-item expanded "><a href="chall_3.html"><strong aria-hidden="true">19.</strong> Challenge 3</a></li><li class="chapter-item expanded "><a href="chall_4.html"><strong aria-hidden="true">20.</strong> Challenge 4</a></li></ol>
</div>
<div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
</nav>
<div id="page-wrapper" class="page-wrapper">
<div class="page">
<div id="menu-bar-hover-placeholder"></div>
<div id="menu-bar" class="menu-bar sticky bordered">
<div class="left-buttons">
<button id="sidebar-toggle" class="icon-button" type="button" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar">
<i class="fa fa-bars"></i>
</button>
<button id="theme-toggle" class="icon-button" type="button" title="Change theme" aria-label="Change theme" aria-haspopup="true" aria-expanded="false" aria-controls="theme-list">
<i class="fa fa-paint-brush"></i>
</button>
<ul id="theme-list" class="theme-popup" aria-label="Themes" role="menu">
<li role="none"><button role="menuitem" class="theme" id="light">Light</button></li>
<li role="none"><button role="menuitem" class="theme" id="rust">Rust</button></li>
<li role="none"><button role="menuitem" class="theme" id="coal">Coal</button></li>
<li role="none"><button role="menuitem" class="theme" id="navy">Navy</button></li>
<li role="none"><button role="menuitem" class="theme" id="ayu">Ayu</button></li>
</ul>
<button id="search-toggle" class="icon-button" type="button" title="Search. (Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar">
<i class="fa fa-search"></i>
</button>
</div>
<h1 class="menu-title">ctfZero_writeup</h1>
<div class="right-buttons">
<a href="print.html" title="Print this book" aria-label="Print this book">
<i id="print-button" class="fa fa-print"></i>
</a>
</div>
</div>
<div id="search-wrapper" class="hidden">
<form id="searchbar-outer" class="searchbar-outer">
<input type="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header">
</form>
<div id="searchresults-outer" class="searchresults-outer hidden">
<div id="searchresults-header" class="searchresults-header"></div>
<ul id="searchresults">
</ul>
</div>
</div>
<!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM -->
<script>
document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible');
document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible');
Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) {
link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
});
</script>
<div id="content" class="content">
<main>
<h1 id="the-two-columns"><a class="header" href="#the-two-columns">The Two Columns</a></h1>
<p>The given directory is again a git repository. However, it only gives you a hint if you check the previous commit. The zip name is <code>exclusive_chall.zip</code>. As we did in <a href="./im_committed.html">I'm Committed, or am I?</a>, we unzip the git repo and navigate to the required file. </p>
<p>We need to XOR the two columns one by one to get the required ASCII values of the flag. Here is a simple sheel script to do that.</p>
<pre><code class="language-py">#!/usr/bin/python3
file1 = open("trashhed", "r")
lines = file1.readlines()
flag = ""
for line in lines:
val = [int(x) for x in line.split(" ")]
flag += chr(val[0] ^ val[1])
print(flag)
</code></pre>
</main>
<nav class="nav-wrapper" aria-label="Page navigation">
<!-- Mobile navigation buttons -->
<a rel="prev" href="xor_encryption.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
<i class="fa fa-angle-left"></i>
</a>
<a rel="next" href="a_different_one.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
<i class="fa fa-angle-right"></i>
</a>
<div style="clear: both"></div>
</nav>
</div>
</div>
<nav class="nav-wide-wrapper" aria-label="Page navigation">
<a rel="prev" href="xor_encryption.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
<i class="fa fa-angle-left"></i>
</a>
<a rel="next" href="a_different_one.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
<i class="fa fa-angle-right"></i>
</a>
</nav>
</div>
<!-- Livereload script (if served using the cli tool) -->
<script>
const wsProtocol = location.protocol === 'https:' ? 'wss:' : 'ws:';
const wsAddress = wsProtocol + "//" + location.host + "/" + "__livereload";
const socket = new WebSocket(wsAddress);
socket.onmessage = function (event) {
if (event.data === "reload") {
socket.close();
location.reload();
}
};
window.onbeforeunload = function() {
socket.close();
}
</script>
<script>
window.playground_copyable = true;
</script>
<script src="elasticlunr.min.js"></script>
<script src="mark.min.js"></script>
<script src="searcher.js"></script>
<script src="clipboard.min.js"></script>
<script src="highlight.js"></script>
<script src="book.js"></script>
<!-- Custom JS scripts -->
</div>
</body>
</html>