Patrick Brunschwig: > On 25.03.16 12:03, flapflap wrote: >> Hi, >> >> (using Enigmail 1.8.2 from Debian stable) >> >> For some time already, Enigmail provides Message Filters that allow the >> user to permanently decrypt a message or to create an encrypted copy of >> a message. >> That is quite a nice feature for my long term email archive which is >> stored on encrypted disk. >> >> However, I noted that using these filters emails are not only decrypted >> but also the signature (if available) is stripped. I know this affects >> PGP/MIME emails but I didn't test Inline PGP. >> >> o Is it possible to keep a signature after decryption? >> o Or is this an inherent property of PGP/MIME/Inline PGP emails, that >> the email cannot be /only/ encrypted?
(Of course I meant "decrypted" here) > It depends on the used protocol. If mails are signed and encrypted in > two steps (RF 3156, section 6.1), then Enigmail would only remove the > encryption, but leave the signature intact. > > However, Enigmail and many other mail clients use the "combined" method. > That is, mails are signed and encrypted in one step. This case, there is > no extra signature. In theory it should be possible to extract the > signature from the encrypted data, and re-create a signed message from > it. However, GnuPG does not offer functionality to extract a signature > from a signed+encrypted message, and it's not likely that such > functionality will ever be implemented [1]. Although not what I would have ultimately liked to hear, but absolutely reasonable and something I can live with. Thanks! ~flapflap _______________________________________________ enigmail-users mailing list [email protected] To unsubscribe or make changes to your subscription click here: https://admin.hostpoint.ch/mailman/listinfo/enigmail-users_enigmail.net
