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Article #1335query: how to synch crypto streams
From: Marcus J. "Buddy can you spare a...
Date: Thu, 15 Oct 1992 16:23
Date: Thu, 15 Oct 1992 16:23
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I'm just wondering. What kinds of techniques are usually used for synching two crypto streams? Suppose I have a pair of boxes that each can talk DES. There is a wire between them. I want to pass data back and forth encrypted. What kinds of tricks might I use to get them both talking together (and able to understand eachother) ;) without having to pass some kind of a key over the wire that an enemy could use? This seems to me to be a pretty hard problem to solve, but if I'm not mistaken there are boxes out there that do exactly this. Or do they just assume that the bag guys didn't manage to tap the first few packets that go back and forth? Do they somehow save state between calls? mjr. -- It is important to focus on writing software that is "adequate." Having one's software be "good" or even "excellent" is over-rated. If "good" were necessary or even important, DOS would not be the de facto standard operating system. -notebooks of a heretic
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Path: arc1-ca.pugleaf.net!sparky!uunet!pipex!unipalm!uknet!stl!bnrgate!nrcnet0!cunews!torn!utcsri!rpi!zaphod.mps.ohio-state.edu!darwin.sura.net!haven.umd.edu!decuac!hussar.dco.dec.com!mjr From: mjr@hussar.dco.dec.com (Marcus J. "Buddy can you spare a clue?" Ranum) Newsgroups: sci.crypt Subject: query: how to synch crypto streams Message-ID: <1992Oct15.162327.28555@decuac.dec.com> Date: 15 Oct 92 16:23:27 GMT Sender: news@decuac.dec.com (USENET News System) Organization: Digital Equipment Corporation, Washington ULTRIX Resource Center Lines: 19 Nntp-Posting-Host: hussar.dco.dec.com