[145747] in cryptography@c2.net mail archive
Re: towards https everywhere and strict transport security
daemon@ATHENA.MIT.EDU (Florian Weimer)
Thu Aug 26 12:06:36 2010
To: jamesd@echeque.com
Cc: Richard Salz <rsalz@us.ibm.com>, cryptography@metzdowd.com,
=JeffH <Jeff.Hodges@KingsMountain.com>
From: Florian Weimer <fweimer@bfk.de>
Date: Thu, 26 Aug 2010 15:45:34 +0000
In-Reply-To: <4C75D404.5050901@echeque.com> (James A. Donald's message of "Thu\, 26 Aug 2010 12\:40\:04 +1000")
* James A. Donald:
> Every time you layer one communication protocol on top of another, you
> get another round trip.
In this generality, this is not true at all. You're confusing
handshakes with protocol layering. You can do the latter without the
former. For example, DNS uses UDP without introducing additional
round trips because there is no explicit handshake. Lack of handshake
generally makes error recovery quite complex once there are multiple
protocol versions you need to support, but handshaking is *not* a
consequence of layering.
--=20
Florian Weimer <fweimer@bfk.de>
BFK edv-consulting GmbH http://www.bfk.de/
Kriegsstra=DFe 100 tel: +49-721-96201-1
D-76133 Karlsruhe fax: +49-721-96201-99
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