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<h1>The International Obfuscated C Code Contest</h1>
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<h2>2006/grothe - Most obfuscated audio</h2>
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<a class="Left" href="../borsanyi/index.html">← 2006/borsanyi</a>
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<a class="Left" href="../index.html">↑ 2006 ↑</a>
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<a class="Left" href="../hamre/index.html">2006/hamre →</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2006/grothe/grothe.c">C code</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2006/grothe/Makefile">Makefile</a>
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<a class="Right" href="#inventory">Inventory</a>
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<a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F2006%2Fgrothe%2Findex.html">✓</a>
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<h2 id="author">Author:</h2>
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<ul>
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<li>Name: <a href="../../authors.html#Aaron_Grothe">Aaron Grothe</a><br>
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Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)</li>
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<!-- BEFORE: 1st line of markdown file: 2006/grothe/README.md -->
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<h2 id="to-build">To build:</h2>
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<pre><code> make</code></pre>
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||
<p><strong>NOTE</strong>: this entry requires the <code>X11/Xlib.h</code> header file and the X11 library to
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||
compile. For more information see the
|
||
FAQ on “<a href="../../faq.html#X11">X11</a>”.</p>
|
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<h2 id="to-use">To use:</h2>
|
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<pre><code> ./grothe carrier_freq pixelclock horizontal_total < some_input.txt</code></pre>
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<h2 id="try">Try:</h2>
|
||
<p>Put on your “electronic ears” and then try:</p>
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||
<pre><code> ./try.sh</code></pre>
|
||
<p>You may find using
|
||
a tunable scanning electronic ear helps.</p>
|
||
<h2 id="judges-remarks">Judges’ remarks:</h2>
|
||
<p>Most of the time, interference is annoying. This entry is the
|
||
exception that proves the rule. What is a bug to some is a
|
||
feature to this entry. :-)</p>
|
||
<h2 id="authors-remarks">Author’s remarks:</h2>
|
||
<p>The program draws patterns on the screen that can be picked up by a
|
||
<a href="https://en.wikipedia.org/wiki/Shortwave_radio">shortwave radio</a>. It emulates
|
||
the frequencies for an old fashion touch tone phone, so old songs can be played
|
||
by hitting <code>0-9</code>,<code>#</code>, and <code>*</code>.</p>
|
||
<p>To be able to run the program you need to determine the following
|
||
parameters:</p>
|
||
<ul>
|
||
<li><code>carrier_freq</code>
|
||
<ul>
|
||
<li>base frequency used to host music</li>
|
||
</ul></li>
|
||
<li><code>pixelclock</code>
|
||
<ul>
|
||
<li>refresh rate of the monitor</li>
|
||
</ul></li>
|
||
<li><code>horizontal_total</code>
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||
<ul>
|
||
<li>total scan along the horizontal axis</li>
|
||
</ul></li>
|
||
</ul>
|
||
<p>If you have <code>xvidtune</code> installed you can get the <code>pixelclock</code> and
|
||
<code>horizontal_total</code> with the following command</p>
|
||
<pre><code> xvidtune -show | head -n 1 | awk '{ print "pixelclock " $2 * 1000000 " horizontal_total = " $6 }'</code></pre>
|
||
<p>Example from my laptops:</p>
|
||
<pre><code> ./grothe 65000000 10000000 1344 < twinkle.txt</code></pre>
|
||
<p>Even if the user gets a setting off, the sound will usually be able to be
|
||
heard on <a href="https://en.wikipedia.org/wiki/AM_broadcasting">AM</a> at a multiple of
|
||
the original frequency.</p>
|
||
<p>The core idea of using a machine to play music on AM radio goes all the
|
||
way back to the <a href="https://en.wikipedia.org/wiki/Altair_8800">Altair computers</a>
|
||
and <a href="https://en.wikipedia.org/wiki/ZX81">Timex Sinclair ZX-81</a>s.</p>
|
||
<h3 id="several-example-songs">Several example songs</h3>
|
||
<p>Olympics Fanfare - from <code>antang@phakt.usc.edu</code> - Tony:</p>
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||
<pre><code> 4-9-91231,2222-321123123-9-91231,2222-32112321</code></pre>
|
||
<p>Twinkle Twinkle Little Star - from <code>fsufunkyb@aol.com</code> - Ben Schmidt:</p>
|
||
<pre><code> 1199##9-6633221-9966332-9966332-1199#9-6633221-</code></pre>
|
||
<p>Generic Arabian Tune - from <code>rdippold@qualcomm.com</code> - Ron “Asbestos” Dippold:</p>
|
||
<pre><code> 453,54,4569564459,9#95458,8987453 54</code></pre>
|
||
<p>Others can be found by doing a search for “touch tone phone songs”.</p>
|
||
<h3 id="obfuscations">Obfuscations</h3>
|
||
<ul>
|
||
<li>Some numbers expressed in Octal, some in hex and some in decimal:</li>
|
||
</ul>
|
||
<blockquote>
|
||
<p>“A foolish consistency is the hobgoblin of little minds.” - Ralph Waldo
|
||
Emerson.</p>
|
||
</blockquote>
|
||
<ul>
|
||
<li>Funky scoping, looking at the nanosleep section and <code>XsetWindowAttributes</code>
|
||
declares local variables.</li>
|
||
<li>Algorithm is very weird, uses <code>y</code> dimension to draw carrier frequency
|
||
and <code>x</code> dimension to draw audio frequency, based on <a href="http://www.erikyyy.de">Erik
|
||
Thiele</a>’s
|
||
<a href="http://www.erikyyy.de/tempest/">Tempest for Eliza</a>.</li>
|
||
<li>lack of <code>#define</code>s confuses many people :-)</li>
|
||
<li>figuring out your <code>pixelclock</code> and <code>horizontal_total</code> and which <code>carrier_freq</code>
|
||
to use can be an exercise in obfuscation for the user.</li>
|
||
<li>use of commas in various places, confuses most C code beautifiers
|
||
sometimes making the beautified code harder to read</li>
|
||
<li>use of <code>static</code> to ensure initialization is EVIL and done in several
|
||
places</li>
|
||
<li>uses <code>static</code> declarations & <code>void</code> function returns we don’t care about
|
||
making the code harder to read.</li>
|
||
<li>does sound using only <a href="https://en.wikipedia.org/wiki/Xlib">X11 libs</a>, no other
|
||
libs required.</li>
|
||
<li>demonstrates tempest emissions in a fun/easy way.</li>
|
||
<li>follows good programming practices of actually setting exit codes and giving
|
||
usage when run with incorrect parameters.</li>
|
||
</ul>
|
||
<h3 id="references">References</h3>
|
||
<p><a href="http://www.erikyyy.de/tempest/">Tempest for Eliza - Basis for Algorithms</a>.</p>
|
||
<p><a href="https://web.archive.org/web/20070612152538if_/http://silcnet.org/priikone/programs/tempest-AM-1.0.tar.gz">Tempest
|
||
AM</a>
|
||
- Another early program in this field. See
|
||
<a href="https://web.archive.org/web/20070612152538/http://silcnet.org/priikone/programs.php?lang=en">here</a>
|
||
for a bit more information on the program (search for <code>Tempest-AM Radio Signal Transmitter</code>).</p>
|
||
<p>The paper
|
||
<a href="https://www.cl.cam.ac.uk/~mgk25/ih98-tempest.pdf">Soft Tempest: Hidden Data Transmission Using Electromagnetic
|
||
Emanations</a> by Markus G.
|
||
Kuhn’s and Ross J. Anderson’s.</p>
|
||
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|
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|
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|
||
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|
||
|
||
For more information, see:
|
||
|
||
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|
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|
||
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|
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||
<div id="inventory">
|
||
<h1 id="inventory-for-2006grothe">Inventory for 2006/grothe</h1>
|
||
</div>
|
||
<h2 id="primary-files">Primary files</h2>
|
||
<ul>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2006/grothe/grothe.c">grothe.c</a> - entry source code</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2006/grothe/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2006/grothe/grothe.orig.c">grothe.orig.c</a> - original source code</li>
|
||
<li><a href="arabian.txt">arabian.txt</a> - sample input</li>
|
||
<li><a href="olympic.txt">olympic.txt</a> - sample input</li>
|
||
<li><a href="test.txt">test.txt</a> - sample input</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2006/grothe/try.sh">try.sh</a> - script to try entry</li>
|
||
<li><a href="twinkle.txt">twinkle.txt</a> - sample input</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="2006_grothe.tar.bz2">2006_grothe.tar.bz2</a> - download entry tarball</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2006/grothe/README.md">README.md</a> - markdown source for this web page</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2006/grothe/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2006/grothe/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2006/grothe/.path">.path</a> - directory path from top level directory</li>
|
||
<li><a href="index.html">index.html</a> - this web page</li>
|
||
</ul>
|
||
<hr style="width:10%;text-align:left;margin-left:0">
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<h4>
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Jump to: <a href="#">top</a>
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<div id="copyright"><h3>Copyright © 1984-2024 by Landon Curt Noll:
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<a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean"
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target="_blank"
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rel="license noopener noreferrer">Some Rights Reserved</a></h3>
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<p>
|
||
This work is <b>licensed by Landon Curt Noll</b> under
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<b><a href="https://creativecommons.org/licenses/by-sa/4.0/?ref=chooser-v1"
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target="_blank"
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rel="license noopener noreferrer"
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style="display:inline-block;">CC BY-SA 4.0</a></b>.
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src="../../png/by.png"
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You should <b>carefully review</b> the
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target="_blank"
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rel="license noopener noreferrer">CC BY-SA 4.0 LEGAL CODE</a></b>
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before using the licensed material.<br>
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You may wish to review the
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target="_blank"
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rel="license noopener noreferrer">highlights of some of the key features and terms</a></b>
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of <b>CC BY-SA 4.0</b>.<br>
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</div>
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|
||
<div id="coda"><h3>Coda</h3>
|
||
<p>
|
||
<a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F2006%2Fgrothe%2Findex.html" rel="nofollow">Nu HTML check this web page</a><br>
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<a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a><br>
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