15 lines
2.5 KiB
HTML
15 lines
2.5 KiB
HTML
<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>tumbler</title><link rel="stylesheet" href="../../jargon.css" type="text/css"/><meta name="generator" content="DocBook XSL Stylesheets V1.61.0"/><link rel="home" href="../index.html" title="The Jargon File"/><link rel="up" href="../T.html" title="T"/><link rel="previous" href="tube-time.html" title="tube time"/><link rel="next" href="tunafish.html" title="tunafish"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">tumbler</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="tube-time.html">Prev</a> </td><th width="60%" align="center">T</th><td width="20%" align="right"> <a accesskey="n" href="tunafish.html">Next</a></td></tr></table><hr/></div><dt><a id="tumbler"/><dt xmlns="" id="tumbler"><b>tumbler</b>: <span xmlns="http://www.w3.org/1999/xhtml" class="grammar">n.</span></dt></dt><dd><p>1. [Originally from the Xanadu hypertext project] A tumbler is a
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<a href="../M/magic-cookie.html"><i class="glossterm">magic cookie</i></a> generated as part of a record or
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message to give it a unique identity. Usually a tumbler includes an
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encoded form of its creation date, but if a software system has
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more than one concurrent process that could generate tumblers
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it must also include an encoding of the process ID. If tumblers will be
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shared across multiple network hosts, they must also include the host name
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or network address. Tumblers often include a hash of the rest of the
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message or record content so that it is possible to verify the
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correctness of the data the tumbler is attached to.</p></dd><dd><p>2. Variant text added to spam instances (often in the Subject line) to
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make them unique. This kind of tumbler is used to defeat schemes that
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check an exact hash of an incoming message against known spam signatures;
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it also compromises some kinds of statistical spam recognition.</p></dd><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="tube-time.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="../T.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="tunafish.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">tube time </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> tunafish</td></tr></table></div></body></html>
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