Remove hint.html and index.html
As per discussions on GitHub the index.html and hint.html files should be deleted in favour of README.md files (from any .text/.txt/.markdown/.md files which will be turned into README.md in an upcoming commit).
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta name="GENERATOR" content="mkd2html 2.1.5a DL=DISCOUNT">
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<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=utf-8">
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<link rel="stylesheet"
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type="text/css"
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href="../hint.css">
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<title>Most surreptitious</title>
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</head>
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<body>
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<h1>Most surreptitious</h1>
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<p>Don Yang<br>
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<a href="mailto:omoikane@uguu.org">omoikane@uguu.org</a><br>
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<a href="http://uguu.org/">http://uguu.org/</a></p>
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<h2>Judges' comments:</h2>
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<h3>To build:</h3>
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<pre><code>make nyaruko
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</code></pre>
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<h3>To run:</h3>
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<pre><code>./nyaruko [seed.txt] < original.bin > output.c
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bash output.c > key.c
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perl output.c > data.c
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cat key.c data.c > output.c
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gcc output.c -o output
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./output > regenerated.bin
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</code></pre>
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<h3>Try:</h3>
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<pre><code>echo "A quick brown fox jumps over the lazy dog" | ./nyaruko > output.c
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perl output.c > data.c
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gcc -o data data.c
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./data
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gcc -o output output.c
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./output
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</code></pre>
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<h3>Selected Judges Remarks:</h3>
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<p>The judges have nothing to add that has not already been written
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about in the spoiler.html.gz file! :-)</p>
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<h2>Author’s comments:</h2>
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<h1>Usage</h1>
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<p>Nyaruko is a binary to text filter. Given some input on stdin,
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Nyaruko will produce C code that reproduces this input on stdout:</p>
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<pre><code>./nyaruko < original.bin > output.c
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gcc output.c -o output
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./output > regenerated.bin
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</code></pre>
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<p>Output is encrypted, but both key and data are included in the output.
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To separate the key from the data, run these commands:</p>
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<pre><code>bash output.c > key.c
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perl output.c > data.c
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</code></pre>
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<p>The key-less data.c still compiles, but produces a different message
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on stdout instead of the original input. This message is a hint to
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why the code is formatted the way it is.</p>
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<p>To combine the key and data, concatenate them together in either
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order:</p>
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<pre><code>cat key.c data.c > output.c
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cat data.c key.c > output.c
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</code></pre>
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<p>By default, Nyaruko generates a unique random key for every message,
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using /dev/urandom as the seed. If given an extra command line
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argument, Nyaruko will seed using that file instead of /dev/urandom:</p>
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<pre><code>./nyaruko seed.txt < input.bin > output.c
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</code></pre>
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<p>This makes the output key deterministic, allowing the same key to be
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shared across different files. On operating systems that do not have
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/dev/urandom, users should always specify this extra seed argument to
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avoid deterministic keys.</p>
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<h1>Features</h1>
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<p>Implementation details that makes Nyaruko more obfuscated than usual
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programs:</p>
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<ul>
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<li> Nyaruko recycles variables and buffers to reduce internal state.
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The variable names are also carefully chosen for mixed-case
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madness.</li>
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<li> Nyaruko employs some preprocessor magic to share much of the same
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code and state between the encoder and decoder, and to increase
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occurrences of smileys ;)</li>
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</ul>
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<p>Output code has these features:</p>
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<ul>
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<li> Fits nicely under 80 columns, and does not contain any trigraphs.</li>
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<li> Uses a fairly efficient encoding scheme, better than uuencode for
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files larger than ~13K, and better than base64 for files larger
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than 20K.</li>
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<li> Encryption with ISAAC, a cryptographically secure pseudorandom
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number generator.</li>
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<li> Trivial 3 language polyglot.</li>
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</ul>
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<p>Code layout is meant to resemble Nyaruko, also known as Nyarlathotep,
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the Crawling Chaos. The most obvious thing to do with chaos is to
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make a random number generator, and the most obvious thing to do with
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a random number generator is to make one-time-pads for encryption.</p>
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<h1>Compatibility</h1>
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<p>Nyaruko has these environment dependencies:</p>
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<ul>
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<li> Requires ASCII character set.</li>
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<li> Assumes sizeof(unsigned int) == 4.</li>
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<li> Best viewed with tab stops set to 8 spaces.</li>
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</ul>
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<p>Output code has the same dependencies, with the additional
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requirement that the compiler must support arbitrarily long string
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literals. Maximum input size that can be encoded while still
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producing standard-compliant output is ~276 bytes for C89, and ~3168
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bytes for C99.</p>
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<p>Nyaruko has been to verified to work with these compiler/OS
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combinations:</p>
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<ul>
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<li> gcc 4.4.5 on Linux (32bit and 64bit)</li>
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<li> clang 3.1 on Windows (Cygwin)</li>
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<li> gcc 4.5.3 on Windows (Cygwin)</li>
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<li> gcc 4.5.3 on Windows (MingW)</li>
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<li> gcc 4.3.5 on JSLinux</li>
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<li> tcc 0.9.25 on JSLinux</li>
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</ul>
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<p>Note that on MingW, stdin and stdout are not opened in binary mode by
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default, this means Nyaruko may not faithfully encode files on MingW.</p>
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<h1>Extra files</h1>
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<p>spoiler.html.gz - Contains full recording of how the code went from
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blank state to an obfuscated program, gzipped to fit under 1MB.</p>
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<hr />
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<TABLE><TR>
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<TD><a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/"><img alt="Creative Commons License" style="border-width:0" src="http://i.creativecommons.org/l/by-sa/3.0/88x31.png" /></a></TD>
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<TD><P>© Copyright 1984-2015,
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<A HREF="/judges.html">Leo Broukhis, Simon Cooper, Landon Curt Noll</A>
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- All rights reserved<BR>
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This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/">Creative Commons Attribution-ShareAlike 3.0 Unported License</a>.</P></TD>
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<TD> <!--<a href="http://validator.w3.org/check?uri=referer"><img src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01 Transitional" height="31" width="88"></a>--></TD>
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</TR></TABLE>
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</body>
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</html>
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