Hi there--

On Wed 2016-02-24 17:37:32 -0500, Datse Multimedia Information wrote:
> When I opened Thunderbird today I received a message about the use of
> PGP-MIME as the new "default setting".  The "old" recommednation was
> that inline PGP (at least for signed messages, though not nescesarily
> for messages which are encrypted) was more compatable.

That decision has been a contentious one for years, and the balance has
tipped in favor of well-structured PGP/MIME messages.

A (non-exhaustive) list of arguments against inline PGP signatures is
here:

  https://dkg.fifthhorseman.net/notes/inline-pgp-harmful/

It's probably not worth re-kindling a flamewar here about this topic.

> With an inline PGP message I see that the message is sent with a pretty
> standard text based message.

Most "standard" messages today are not just plain text, especially not
raw US-ASCII.  even the text/plain messages are often base64-encoded or
quoted-printable-encoded UTF-8.  But most messages today aren't just
text/plain, much as some of us wish they were: they're text/html, or
multipart/alternative, or they have attachments, etc.  PGP/MIME handles
all of those forms in a sensible fashion.

> The problem that I see is that with inline MIME, there is an increased
> risk of not being able to verify signatures which *should* be valid, or
> the rendering of the email to be impossible to decrypt.

When you say "inline MIME", i'm assuming you mean "inline PGP".

There are lots of ways to break signatures; inline PGP signatures can
(and are) easily broken by MTAs as well.  This is in the nature of
cryptographic signature schemes -- any byte added or removed anywhere in
the part can actually break the signature.

Regards,

     --dkg

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