Update & reformat 1987 in 1984 style
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Landon Curt Noll committed
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<!DOCTYPE html>
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<html xmlns="http://www.w3.org/1999/xhtml" lang="" xml:lang="">
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<head>
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<meta charset="utf-8" />
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<meta name="generator" content="pandoc" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes" />
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<title>hint</title>
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<style>
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html {
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line-height: 1.5;
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font-family: Georgia, serif;
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font-size: 20px;
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color: #1a1a1a;
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background-color: #fdfdfd;
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}
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body {
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margin: 0 auto;
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max-width: 36em;
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padding-left: 50px;
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padding-right: 50px;
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padding-top: 50px;
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padding-bottom: 50px;
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hyphens: auto;
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overflow-wrap: break-word;
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text-rendering: optimizeLegibility;
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font-kerning: normal;
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}
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@media (max-width: 600px) {
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body {
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font-size: 0.9em;
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padding: 1em;
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}
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h1 {
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font-size: 1.8em;
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}
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}
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@media print {
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body {
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background-color: transparent;
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color: black;
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font-size: 12pt;
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}
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p, h2, h3 {
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orphans: 3;
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widows: 3;
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}
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h2, h3, h4 {
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page-break-after: avoid;
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}
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}
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p {
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margin: 1em 0;
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}
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a {
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color: #1a1a1a;
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}
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a:visited {
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color: #1a1a1a;
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}
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img {
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max-width: 100%;
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}
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h1, h2, h3, h4, h5, h6 {
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margin-top: 1.4em;
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}
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h5, h6 {
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font-size: 1em;
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font-style: italic;
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}
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h6 {
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font-weight: normal;
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}
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ol, ul {
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padding-left: 1.7em;
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margin-top: 1em;
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}
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li > ol, li > ul {
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margin-top: 0;
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}
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blockquote {
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margin: 1em 0 1em 1.7em;
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padding-left: 1em;
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border-left: 2px solid #e6e6e6;
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color: #606060;
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}
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code {
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font-family: Menlo, Monaco, 'Lucida Console', Consolas, monospace;
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font-size: 85%;
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margin: 0;
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}
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pre {
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margin: 1em 0;
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overflow: auto;
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}
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pre code {
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padding: 0;
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overflow: visible;
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overflow-wrap: normal;
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}
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.sourceCode {
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background-color: transparent;
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overflow: visible;
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}
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hr {
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background-color: #1a1a1a;
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border: none;
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height: 1px;
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margin: 1em 0;
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}
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table {
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margin: 1em 0;
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border-collapse: collapse;
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width: 100%;
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overflow-x: auto;
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display: block;
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font-variant-numeric: lining-nums tabular-nums;
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}
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table caption {
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margin-bottom: 0.75em;
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}
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tbody {
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margin-top: 0.5em;
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border-top: 1px solid #1a1a1a;
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border-bottom: 1px solid #1a1a1a;
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}
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th {
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border-top: 1px solid #1a1a1a;
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padding: 0.25em 0.5em 0.25em 0.5em;
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}
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td {
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padding: 0.125em 0.5em 0.25em 0.5em;
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}
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header {
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margin-bottom: 4em;
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text-align: center;
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}
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#TOC li {
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list-style: none;
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}
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#TOC ul {
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padding-left: 1.3em;
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}
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#TOC > ul {
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padding-left: 0;
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}
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#TOC a:not(:hover) {
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text-decoration: none;
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}
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code{white-space: pre-wrap;}
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span.smallcaps{font-variant: small-caps;}
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div.columns{display: flex; gap: min(4vw, 1.5em);}
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div.column{flex: auto; overflow-x: auto;}
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div.hanging-indent{margin-left: 1.5em; text-indent: -1.5em;}
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ul.task-list{list-style: none;}
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ul.task-list li input[type="checkbox"] {
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width: 0.8em;
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margin: 0 0.8em 0.2em -1.6em;
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vertical-align: middle;
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}
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.display.math{display: block; text-align: center; margin: 0.5rem auto;}
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</style>
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<!--[if lt IE 9]>
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<script src="//cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.3/html5shiv-printshiv.min.js"></script>
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<![endif]-->
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</head>
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<body>
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<h1 id="most-useful-obfuscation">Most Useful Obfuscation</h1>
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<p>Larry Wall<br />
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Unisys - System Development Group Santa Monica<br />
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9132 Kester Ave<br />
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Panorama City, CA 91402 USA</p>
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<h2 id="to-build">To build:</h2>
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<pre><code> make all</code></pre>
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<h2 id="judges-comments">Judges’ comments:</h2>
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<h3 id="try">Try:</h3>
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<pre><code>lwall | bc | lwall
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input: x*x
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input: c^2</code></pre>
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<h3 id="also-try">Also try:</h3>
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<pre><code>lwall | bc and lwall | cat</code></pre>
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<p>What we found amazing was how the flow of control was transferred
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between subroutines. Careful inspection will show that the array of
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pointers to functions named ‘vi’ refers to functions which seem to not
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be directly called. Even so, these pointers to functions are being used
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as an argument to signal. Can you determine why this is being done and
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how it is being exploited?</p>
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<p>Some compilers complained about this file, so we changed: ‘=++I’ to
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‘= ++I’.</p>
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<p>Copyright (c) 1987, Landon Curt Noll & Larry Bassel. All Rights
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Reserved. Permission for personal, educational or non-profit use is
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granted provided this this copyright and notice are included in its
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entirety and remains unaltered. All other uses must receive prior
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permission in writing from both Landon Curt Noll and Larry Bassel.</p>
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</body>
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</html>
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