Re: SSH and SSL - which positions do they occupy in the OSI model?
From: Dimitri Maziuk (dima@127.0.0.1)Date: 10/05/02
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From: Dimitri Maziuk <dima@127.0.0.1> Date: Sat, 5 Oct 2002 00:06:55 +0000 (UTC)
thus spake NeXTstep:
> Hello,
>
> Which position of the OSI model, do SSL and SSH occupy?
If TCP/IP used OSI model, SSL would fit into session layer.
However, TCP/IP designers couldn't quite figure out the use
for session & presentation layers: there was no SSL back then,
and (presentation layer) they weren't going to convert EBCDIC
to ASCII or little- to big-endian inside the network stack. So
they laughed at "unnecessarily complex" OSI model "designed by
committee", and used a simpler 4-layer model for TCP/IP.
And then came little-endian computers and encryption. And the
code to support them had to be built in/linked to each individual
application because it didn't quite fit in TCP/IP stack.
Main advantage of the simpler TCP/IP model is that it simplifies
one's homework: for all $foo in TCP/IP, there's a 99% chance that
$foo is in application layer. All one has to remeber is 1% that
isn't.
HTH, HAND
Dima
--
...the mainstream products of major vendors largely ignore these demonstrated
technologies... [Instead, their customers] are left with several ineffective
solutions collected under marketing titles like "defense in depth".
-- Thirty Years Later: Lessons from the Multics Security Evalution
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