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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>spoof</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="../S.html" title="S"/><link rel="previous" href="sponge.html" title="sponge"/><link rel="next" href="spool.html" title="spool"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">spoof</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="sponge.html">Prev</a> </td><th width="60%" align="center">S</th><td width="20%" align="right"> <a accesskey="n" href="spool.html">Next</a></td></tr></table><hr/></div><dt><a id="spoof"/><dt xmlns="" id="spoof"><b>spoof</b>: <span xmlns="http://www.w3.org/1999/xhtml" class="grammar">vi.</span></dt></dt><dd><p> To capture, alter, and retransmit a communication stream in a way
that misleads the recipient. As used by hackers, refers especially to
altering TCP/IP packet source addresses or other packet-header data in
order to masquerade as a trusted machine. This term has become very
widespread and is borderline techspeak. Interestingly, it was already in
use in its modern sense more than a century ago among Victorian
telegraphers; it shows up in Kipling.</p></dd><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="sponge.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="../S.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="spool.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">sponge </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> spool</td></tr></table></div></body></html>