[lamps] HP Issue - Obfuscation of Header Fields

Bernie Hoeneisen <bernie@ietf.hoeneisen.ch> Wed, 30 September 2020 20:17 UTC

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From: Bernie Hoeneisen <bernie@ietf.hoeneisen.ch>
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Subject: [lamps] HP Issue - Obfuscation of Header Fields
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Below a summary of the issue on 'Obfuscation of Header Fields'. If anybody 
wishes to discuss this topic further or does not agree with the 
conclusion, please speek up within the next 10 days!

cheers,
  Bernie


Text from slide:
- Should we recommend any specific format for obfuscation?
   e.g.
   - Subject: ...
   - Subject: [...]
   - Date: Thu, 01 Jan 1970 00:00:00 +0000 (UTC)
     - Impact to certificate checking?
   - Date: <set to Monday 9am of the same week>
   - Message-ID: <a new randomly generated Message-ID>
   - From: Obfuscated <anonymous@anonymous.invalid>
   - To: Obfuscated <anonymous@anonymous.invalid>

- Impact to Spam filtering?


Conclusion at IETF-108 (as I understood):

- Only specify obfuscation if encryption is applied
- Only recommend obfuscation for the Subject HF, but not for
   Date HF, From HF, To HF

We did not discuss about whether or not to recommend a new Message-ID for 
the Outer Message, as the Message-ID often leaves a trace to the 
originator host. Unless there are strong reasons not to do so, I'd be in 
favour of recommending a new randomly generated Messsage-ID. Any opinions 
on this?