From: Jiri Baum <jirib@sweeney.cs.monash.edu.au>
Date: Tue, 24 Oct 95 00:10:45 PDT
To: hfinney@shell.portal.com (Hal)
Subject: Re: subjective names and MITM
In-Reply-To: <199510061708.KAA27047@jobe.shell.portal.com>
Message-ID: <199510240659.QAA07645@sweeney.cs.monash.edu.au>
MIME-Version: 1.0
Content-Type: text/plain


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Hello Hal <hfinney@shell.portal.com>
  and cypherpunks@toad.com

hfinney wrote (but didn't sign):
> jbaber@mi.leeds.ac.uk writes (where I have taken the liberty of
> reformatting for 80 columns):
> 
> > Now mail is far easier to fake/intercept than a digital
> > signature/encryption - at least I hope so. Therefore if Hal where to
...
> 
> Well, this is not necessarily the case.  A MITM may be signing my
> messages for me, and then putting them back the way they were before I
> am allowed to see them.  Granted, this would not be easy, and perhaps
...
> futile.  Doesn't this bother you?

The point is that what if there's a MIMT who is changing the signatures
on the hfinney posts? What if originally they were signed "Alice" but
then a MIMT went and substituted "Hal"?

Then any reputation I attached to Hal should really go to Alice, no?
And even when I get a certified key for Hal, I still can't really put
the reputation onto it, since maybe the reputation really belongs to
Alice.

Doesn't this bother you?

At least with digital signatures I can be certain that the same person
always signed the messages (and that ri cannot repuditate them), even
if I don't necessarily know who that person is. (I guess the issue
becomes plagiarism rather than impersonation.)


Hope that makes sense...

Jiri
- --
If you want an answer, please mail to <jirib@cs.monash.edu.au>.
On sweeney, I may delete without reading!
PGP 463A14D5 (but it's at home so it'll take a day or two)
PGP EF0607F9 (but it's at uni so don't rely on it too much)

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