S/MIME encryption mangles special characters
Reported by Volker Kopetzky | June 8th, 2016 @ 09:36 AM
When sending an email with special characters like german
umlauts (äÄöÖüÜß), the
receipient see's them as encoded strings, e.g.
können shows as k=C3=B6nnen.
It worked before (as oh so often), and I used another computer
where I downloaded the key/certificate again. Yet it now happens on
all machines.
I tried exporting/importing the certificate and private key to the
osx keychain, but the problem persists.
My main issue right now is that I do not have a working instance where the umlauts can be read.
Any other ideas?
Comments and changes to this ticket
-
Volker Kopetzky June 8th, 2016 @ 11:22 AM
Seems to be fixed now, I'll try to document this for the internet eternal.
- Generate usual S/MIME stuff
- private key
- certificate (cert-A)
- e.g. startssl
- Import to os x key chain
- exchange signatures with addressee
- Send emails with nice umlauts
- Setup a scond computer (and forget to copy your
certificates)
- regenerate certificate with the same key
cert-B has the same signature as cert-A but different hashes/fingerprint and expiration date than the initial one - send email with cert-B
- receiver gets scrambled umlauts
- ask receiver to import your new cert/signature again
- receiver sees nice umlauts again
Sender: MailMate/mac
Receiver: Outlook/WinKinda makes no sense, does it?
- Generate usual S/MIME stuff
-
benny June 13th, 2016 @ 07:43 AM
- State changed from “new” to “cantreproduce”
What you see as mangling is the so-called quoted-printable encoding. This is used to convert message content to 7 bit (for historic reasons). The problem is unlikely to be related to keys/certificates. It is more likely to be some kind of issue (sender or recipient) which makes decoding the message fail.
If you get MailMate back into this state (in that case, try sending a message to me via “Help ▸ Send Feedback” such that I can see the issue myself).
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Mac OS X email client.
benny