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<h1>The International Obfuscated C Code Contest</h1>
|
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<h2>1992/nathan - Worst abuse of the rules</h2>
|
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<h3>obfuscation by (trivial) encryption (source not exported)</h3>
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<a class="Left" href="../marangon/index.html">← 1992/marangon</a>
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<a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F1992%2Fnathan%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#Nathan_Sidwell">Nathan Sidwell</a><br>
|
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Location: <a href="../../location.html#GB">GB</a> - <em>United Kingdom of Great Britain and Northern Ireland</em> (<em>United Kingdom</em>)</li>
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<!-- BEFORE: 1st line of markdown file: 1992/nathan/README.md -->
|
||
<h2 id="to-build">To build:</h2>
|
||
<pre><code> make all</code></pre>
|
||
<p>There is an Alternate version which is what was originally published. See
|
||
<a href="#alternate-code">Alternate code</a> below for more information.</p>
|
||
<h2 id="to-use">To use:</h2>
|
||
<pre><code> ./nathan
|
||
# enter some text</code></pre>
|
||
<h2 id="try">Try:</h2>
|
||
<p>To see some other fun uses:</p>
|
||
<pre><code> ./try.sh</code></pre>
|
||
<h2 id="alternate-code">Alternate code:</h2>
|
||
<p>At the time of publication, the judges could not publish the code due to the
|
||
US export control over encryption. The code that was published would, if run,
|
||
allow one to get the instructions of how to receive (via email) the actual
|
||
entry. However, on Sat Mar 4 20:09:35 2023 UTC, the previously unseen code was
|
||
published. This meant that the old code was not set to compile via the Makefile.
|
||
This alternate code is that previous version.</p>
|
||
<h2 id="alternate-build">Alternate build:</h2>
|
||
<pre><code> make alt</code></pre>
|
||
<h3 id="alternate-use">Alternate use:</h3>
|
||
<pre><code> ./nathan.alt</code></pre>
|
||
<p><strong>IMPORTANT NOTE</strong>: it is unknown if the email in the code is still valid and as
|
||
one does not need to email the author for the submitted code one should not
|
||
email it. In other words, please do <strong>NOT</strong> send such an email.</p>
|
||
<h2 id="judges-remarks">Judges’ remarks:</h2>
|
||
<h3 id="warning">WARNING:</h3>
|
||
<p>The judges make no claim as to the strength or security
|
||
of this program. It is likely to be nil, or the next
|
||
best thing to it. Still, you might consider installing
|
||
it in <code>/usr/games/nathan</code>. :-)</p>
|
||
<h3 id="note-from-the-judges-about-the-winning-category">Note from the judges about the winning category:</h3>
|
||
<p>The ‘winning’ category is also open to question. One could say
|
||
that it is a ‘file obfuscator’. One could also say that it
|
||
unintentionally abused the intent of rule #7 (that programs
|
||
should be freely re-distributable). We suspect that the author
|
||
may not have intended to do this, but that is the way things go
|
||
sometimes.</p>
|
||
<p>BTW, ‘<em>abuse of the rules</em>’ entries do not violate the rules.
|
||
Entries that violate the rules are disqualified. Abuse of the
|
||
rules entries are ones that tend to ‘stretch’ the limits and
|
||
take the contest into unexpected territory.</p>
|
||
<h3 id="historical-notes-from-the-judges-about-this-entry">Historical notes from the judges about this entry:</h3>
|
||
<p>The US International Traffic in Arms Regulations controls certain exportations
|
||
going out of the United States. The U.S. Munitions List gives the specific
|
||
categories of restricted exports. Because this entry at one time appeared to
|
||
fall under this restricted category, the judges originally were not able to
|
||
distribute some winning entries outside of the US.</p>
|
||
<p>Nathan Sidwell stated that he was willing to distribute the winning source. To
|
||
read HIS instructions of how to obtain his winning program one was able to run:</p>
|
||
<pre><code> make nathan
|
||
./nathan</code></pre>
|
||
<p>to learn how to get a copy of the code.</p>
|
||
<p>When someone compiled and ran the code as originally distributed (see:
|
||
<a href="https://github.com/ioccc-src/winner/blob/master/1992/nathan/nathan.orig.c">nathan.orig.c</a> the code printed
|
||
the following message (sic):</p>
|
||
<blockquote>
|
||
<p>Export of this program from the USA is governed by the US<br>
|
||
Munitions List from the ITAR (International Traffic in Arms<br>
|
||
Regulations). This list gives the specific categories of<br>
|
||
restricted exports and includes cryptographic exports. Traffic<br>
|
||
entirely external to, entirely internal to, or into the USA is<br>
|
||
not restricted.<br>
|
||
To obtain a copy of the program, email to <strong>EMAIL_ADDRESS_OMITTED</strong><br>
|
||
with a subject “IOCCC request”. If you know that your ‘From’<br>
|
||
line is incorrect, add a single line<br>
|
||
“replyto you@your.correct.address” to the body of the message.<br>
|
||
A deamon will autoreply.<br>
|
||
WARNING: You must not re-export this out of the USA, or else<br>
|
||
the men in black might get you.</p>
|
||
</blockquote>
|
||
<p>Today, the <a href="https://github.com/ioccc-src/winner/blob/master/1992/nathan/nathan.c">nathan.c</a> source code
|
||
is the source code is what you would have received had you
|
||
successfully completed the above instructions.</p>
|
||
<p>Today, the above instructions are <strong>no longer necessary</strong>.
|
||
There have been reproduced above to provide historical context. Even so, the
|
||
<a href="#alternate-code">Alternate code</a> allows you to see what the originally
|
||
published code did.</p>
|
||
<h3 id="personal-note-from-chongo">Personal note from chongo:</h3>
|
||
<p>I think the situation showed just how ridiculous US crypto regulations really
|
||
were/are. Certain US federal officials can get away with shipping arms to
|
||
certain nations in apparent violation of US laws, but I personally can’t
|
||
re-distribute a program contest entry to the network!</p>
|
||
<h3 id="updated-personal-note-from-chongo">Updated personal note from chongo:</h3>
|
||
<p>We removed the email address from the above quote (although you can still see it
|
||
in the <a href="https://github.com/ioccc-src/winner/blob/master/1992/nathan/nathan.orig.c">nathan.orig.c</a> and
|
||
<a href="https://github.com/ioccc-src/winner/blob/master/1992/nathan/nathan.alt.c">nathan.alt.c</a> code) because sending
|
||
email to that address is not required today and it is unknown if it is still
|
||
valid. The <a href="https://github.com/ioccc-src/winner/blob/master/1992/nathan/nathan.c">nathan.c</a> file now contains the
|
||
source you would have received in reply.</p>
|
||
<p>Thankfully much of the ridiculous US crypto regulations has been
|
||
amended to the extent where the above historical “<em>workaround</em>” is
|
||
<strong>no longer required</strong>.</p>
|
||
<h2 id="authors-remarks">Author’s remarks:</h2>
|
||
<h3 id="program-use">Program use</h3>
|
||
<p>This program is a hello world text encryptor/decryptor. It uses an
|
||
enigma (I think) style encryption algorithm, where the encryption
|
||
key character is modified by a value, determined from the previous
|
||
character. Non-printable characters (those with ASCII values < <code>' '</code>
|
||
or > <code>0x7e</code>) are passed unaltered, thus any kind of file may be
|
||
successfully processed, but if the original is printable, the
|
||
processed file will be too. The input is read from <code>stdin</code>, and the
|
||
output presented to <code>stdout</code>. The key, a text string, is presented as
|
||
a command argument. This is optional, and if omitted, the file is
|
||
self-{de,en}crypted. To specify decryption, a <code>-</code> should be given
|
||
before the key. (Actually encryption and decryption proper inverse
|
||
operations, so you can use decrypt to scramble and encrypt to
|
||
descramble, if you’re perverse.)</p>
|
||
<h3 id="portability-a-little-knowledge-is-a-dangerous-thing">Portability (A little knowledge is a dangerous thing)</h3>
|
||
<p>It’s written in ANSI C, and doesn’t even assume an ASCII character
|
||
set, (it has an array of the characters to convert), so should be
|
||
portable across many platforms. It passes <code>gcc -ansi -pedantic -O -Wall</code> with no warnings (You may get assignment in conditional
|
||
warnings on other platforms though). Because I’ve heard that
|
||
conditional jumps slow down fast processors, I’ve eliminated all
|
||
the <code>if</code>s from the code; indeed, as its only one statement, it should
|
||
compile to one instruction and a suitably designed CISC machine. To
|
||
speed compilation, there is only one statement in the loop, so that
|
||
another scoping level does not need to be opened.</p>
|
||
<p>Being an encryptor/decryptor, you probably want the source code to
|
||
be obfuscated, to hide the algorithm.</p>
|
||
<h3 id="obfuscation">Obfuscation</h3>
|
||
<p>In spite of the fact that it looks like a nice friendly hello world
|
||
program, it isn’t (as documented above). (Short lines have been padded,
|
||
as you’ll find if you look at an encrypted copy of the source.)</p>
|
||
<p>I’ve also named some of the macros from commonly used functions, just to keep
|
||
things muddy. Of course, all the variables are misnamed. The program is kept
|
||
simply (one for statement), by serious overuse of <code>,</code> and <code>?:</code>. These are really
|
||
confusing when used together, nested or put in argument lists (is that a comma
|
||
operator, or argument separator?).</p>
|
||
<!--
|
||
|
||
Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
|
||
|
||
You are free to share and adapt this file under the terms of this license:
|
||
|
||
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
|
||
|
||
For more information, see:
|
||
|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
-->
|
||
<!-- AFTER: last line of markdown file: 1992/nathan/README.md -->
|
||
|
||
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|
||
|
||
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|
||
|
||
<div id="inventory">
|
||
<h1 id="inventory-for-1992nathan">Inventory for 1992/nathan</h1>
|
||
</div>
|
||
<h2 id="primary-files">Primary files</h2>
|
||
<ul>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/nathan/nathan.c">nathan.c</a> - entry source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/nathan/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/nathan/nathan.alt.c">nathan.alt.c</a> - alternate source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/nathan/nathan.orig.c">nathan.orig.c</a> - original source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/nathan/try.sh">try.sh</a> - script to try entry</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="1992_nathan.tar.bz2">1992_nathan.tar.bz2</a> - download entry tarball</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/nathan/README.md">README.md</a> - markdown source for this web page</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/nathan/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/nathan/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/1992/nathan/.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">
|
||
<h4>
|
||
Jump to: <a href="#">top</a>
|
||
</h4>
|
||
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||
|
||
</div>
|
||
|
||
<!-- END: this line ends content from: inc/after-content.default.html -->
|
||
<!-- START: this line starts content from: inc/footer.inventory.html -->
|
||
|
||
<!--
|
||
|
||
Copyright © 1984-2025 by Landon Curt Noll. All Rights Reserved.
|
||
|
||
You are free to share and adapt this file under the terms of this license:
|
||
|
||
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
|
||
|
||
For more information, see:
|
||
|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
-->
|
||
|
||
<div class="footer">
|
||
|
||
<div id="copyright"><h3>Copyright © 1984-2025 by Landon Curt Noll:
|
||
<a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">Some Rights Reserved</a></h3>
|
||
<p>
|
||
This work is <b>licensed by Landon Curt Noll</b> under
|
||
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/?ref=chooser-v1"
|
||
target="_blank"
|
||
rel="license noopener noreferrer"
|
||
style="display:inline-block;">CC BY-SA 4.0</a></b>.
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/cc.png"
|
||
alt="cc inside circle symbol">
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/by.png"
|
||
alt="person inside circle symbol">
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/sa.png"
|
||
alt="arrow looping back on itself inside circle symbol"><br>
|
||
You should <b>carefully review</b> the
|
||
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode.en"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">CC BY-SA 4.0 LEGAL CODE</a></b>
|
||
before using the licensed material.<br>
|
||
You may wish to review the
|
||
<b><a href="../../license.html"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">highlights of some of the key features and terms</a></b>
|
||
of <b>CC BY-SA 4.0</b>.<br>
|
||
</p>
|
||
</div>
|
||
|
||
<div id="coda"><h3>Coda</h3>
|
||
<p>
|
||
<a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F1992%2Fnathan%2Findex.html" rel="nofollow">Nu HTML check this web page</a><br>
|
||
<a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a><br>
|
||
</p>
|
||
</div>
|
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</div>
|
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</body>
|
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</html>
|
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