Encryption: verify a signature, encrypt attachments

Encryption: verify a signature, encrypt attachments

[bromley]

I have two questions connected with encryption:

1. How to verify a signature without Gnus?

Some of my friends use web interfaces to read email. Can they verify my
PGPMIME signature?

I assume that they should download raw message, save a part of it to a
file, then verify signature using that file.

Is it right? Which part of a raw message should be saved?

2. Can I encrypt an attachment with Gnus?

I've noticed that Gnus only encrypts the body. Can it encrypt
attachments? (I'm using PGPMIME).

Re: Encryption: verify a signature, encrypt attachments

[Adam Sjøgren]

[-- Attachment #1: Type: text/plain, Size: 907 bytes --]

On Tue, 18 Dec 2012 16:01:20 -0500 (EST), bromley@lavabit.com wrote:

> 1. How to verify a signature without Gnus?

One way is to simply use gpg from the command line:

  $ gpg --verify signature.asc content.part

If you are using Thunderbird, you can install the Enigmail extension to
handle signatures (and other PGP-stuff).

> Some of my friends use web interfaces to read email. Can they verify my
> PGPMIME signature?

I think that depends on whether the web interfaces they use support that
functionality?

> I assume that they should download raw message, save a part of it to a
> file, then verify signature using that file.

That would be a way. A very cumbersome way :-)

> Is it right? Which part of a raw message should be saved?

The part that is signed, and the signature.

> 2. Can I encrypt an attachment with Gnus?

Sure.

When you have attached a file, you can either manually change the
"

[-- Attachment #2: Type: text/plain, Size: 504 bytes --]

"-tag to include "encrypt=pgpmime", or you can simply choose
"Encrypt part" from the "Attachments" menu.

I just tested against Thunderbird with Enigmail, and it just ignores the
encrypted attachment, so I guess it depends on the client how well it is
handled - MIME can be tricky (Gnus seems to handle it fine, though).


  Best regards,

    Adam

-- 
 "Fader eg må be om undskyldning                              Adam Sjøgren
  Det er min feil at Tony er pakkt in i presenning"      asjo@koldfront.dk

Re: Encryption: verify a signature, encrypt attachments

[Adam Sjøgren]

On Tue, 18 Dec 2012 22:50:49 +0100, Adam wrote:

> When you have attached a file, you can either manually change the
> "
> "-tag to include "encrypt=pgpmime", or you can simply choose
> "Encrypt part" from the "Attachments" menu.

Ugh. That should have read: 'change the "< # part>"-tag' (without the
spaces). Sorry.


  Best regards,

    Adam

-- 
 "Dom 999 saker                                               Adam Sjøgren
  jag aldrig skulle göra                                 asjo@koldfront.dk
  Dom vägs upp av 999 värre
  saker jag redan har gjort"

Re: Encryption: verify a signature, encrypt attachments

[Reiner Steib]

On Tue, Dec 18 2012, Adam Sjøgren wrote:

> That should have read: 'change the "< # part>"-tag' (without the
> spaces).

,----[ `<f1> k <menu-bar> <Attachments> <Quote MML in region>' ]
| <menu-bar> <Attachments> <Quote MML in region> runs the command
| mml-quote-region, which is an interactive compiled Lisp function in
| `mml.el'.
| 
| It is bound to <menu-bar> <Attachments> <Quote MML in region>, 
| C-c RET q.
| 
| (mml-quote-region BEG END)
| 
| Quote the MML tags in the region.
`----

HTH

Bye, Reiner.
-- 
       ,,,
      (o o)
---ooO-(_)-Ooo---  |  PGP key available  |  http://rsteib.home.pages.de/

Re: Encryption: verify a signature, encrypt attachments

[Adam Sjøgren]

On Fri, 21 Dec 2012 15:43:37 +0100, Reiner wrote:

> On Tue, Dec 18 2012, Adam Sjøgren wrote:

>> That should have read: 'change the "< # part>"-tag' (without the
>> spaces).

> ,----[ `<f1> k <menu-bar> <Attachments> <Quote MML in region>' ]

> | Quote the MML tags in the region.

Ah, nice - thanks!


  Best regards,

    Adam

-- 
 "I went for the police                                       Adam Sjøgren
  But they were all over town                            asjo@koldfront.dk
  I went for the fireengines
  But they were all upside down"