Indeed, the message seems to have been munged somehow. You can see a
screenshot of this in action here:

https://vc.gg/7NXkF0NP

This is pretty easy to reproduce, but if you need any help reproducing
it let me know and I can send you a test off this list.

On 03/06/2016 03:17 PM, Vincent Canfield wrote:
> Hi,
> 
> I found recently that when someone sends me an E-mail signed by another,
> the entire E-mail is treated as signed by that user. To recreate this
> issue, you can do the following in Mozilla Thunderbird:
> 
> - Take an E-mail signed with PGP/MIME and save it as whatever.eml
> - Optionally, open the .eml file and take out the "From", "To", etc.
> headers (will cause the E-mail to take up less space at the bottom)
> - Send an E-mail to anyone using Enigmail with that .eml file as an
> attachment
> - Enigmail treats the entire message as being signed by the signee in
> the .eml file
> 
> I'm not sure if this mailing list will munge my attachment in some way,
> but I have attached a signed message using a key I do not own as a test.
> 
> I'm not sure this is the expected behavior, but it seems to cause
> opportunity for impersonation by anyone in posession of at least one
> PGP/MIME signed message. Considering non-PGP/MIME messages embedded in a
> normal plaintext E-mail will result in the message "Part of the message
> signed;" along with "BEGIN ENCRYPTED or SIGNED PART" descriptors, is
> there any way to turn on similar behavior for PGP/MIME messages?
> 
> Thanks,
> 
> 
> 
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