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Re: what MTAs do, was semantics of the signature

2004-10-10 10:29:59

 However, I do not believe the current
 Charter reflects this problem space very well.  Or rather, to
 put it the other way, the Charter does not constrain the work
 to this problem space.

Indeed.

I am hoping to get a revised version out today or tomorrow. The 
list discussion has been quite fruitful in identifying 
deficiencies in the current draft charter.

  
 Your paragraph above is an excellent starting point for the
 Charter, in my opinion.

I liked it too...


 Separately, I do want to comment briefly on the issue of
 interoperability.  Multipart/signed was designed expressly to
 be backwards compatible with non-MIME-aware email components.
  Consider that the content that was signed appears first and
 the security information second, so as not to distract
 "backwards" components.

"backwards compatible" is certainly the term that was used -- and 
intended -- when multi/sig was developed.  However in the current 
context, it needs clarification.  The two interoperability goals 
that multi/sig achieved were a) not breaking non-supporting 
recipients, and b) permitting non-supporting recipients to 
extract the original text in a manner that was no (too) 
distracting.

My wording is stylized in order to set the stage for the current 
round of effort, as I understand it:

     The new mechanism must be essentially invisible to 
     non-supporting recipients.


 In addition, MTAs may not be MIME-aware but insofar as they
 "handle" virus scanning, they are more than capable of
 dealing with the solution to this problem space.  The only
 reasonable way to do virus scanning is to break a message
 into its parts and scan each part.  An MTA either does this
 or knows how to "call a tool" that does it.  Same for this
 problem space.

I am not understanding how this relates to the current thread. 
Please clarify.


 point out that doing it without MIME does not mean doing it
 without PGP or S/MIME.  That's a separate point worthy of
 debate in the working group.

Since both of their specifications are MIME based, you are 
describing creation of a new specification.

Further, there are additional requirements/constraints that have 
been listed, that neither pgp nor s/mime currently satisfy.

d/
--
Dave Crocker
Brandenburg InternetWorking
+1.408.246.8253
dcrocker at ...
brandenburg.com



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