Re: Simple question

From: AE (hidden_at_nospam.com)
Date: 06/08/03 

Date: Sun, 08 Jun 2003 19:02:23 +0200

This depends on the way A accesses B and C:

Generally A will know only data sent over the network and on an IP
network there is no way to find out whether they are sent from B or C
(as long as there is no hardware-solution like TCPA included) - and
indeed it doesn't matter: A can use digital signatures or a MAC to
verify the data are the same - who cares what computer is used?

In case A controls what software is installed on B and C there might be
different ways to find out about the substitution - like making the
software read the ID of processor or harddisk. There is as well the
special case A does not use IP but ethernet adresses - in that case the
unique ethernet address of the network cards of B and C can be used to
identify the computer - but this number can as well be changed/faked as
the hardware id of a harddisk. It's as well possible to make the
software report a wrong processor id - all depends on the amount of work
done.

AE

Kent Betts wrote:
> I have a simple question. No trick circumstances are implied.
>
> On a computer network, computer A writes to the blank hard drive of computer B.
> The contents of computer hard drive on B is mirrored onto computer C.
>
> If computer C is physically substituted for computer B, is there any way for
> computer A to know that this has occurred?
>
> Thx.
>
> KB
>
>

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