Re: [Enigmail] What about PGP/Header support?

2014-03-16 Thread Jean-David Beyer
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Hash: SHA1

On 03/15/2014 02:28 PM, Egbert van der Wal wrote:
 I actually see encryption as less of an issue. When I send an
 encrypted message to someone, I need to know for sure that the
 recipient knows about PGP encryption and knows how to decode it. If
 I send an encrypted message to someone who does not use PGP, he/she
 cannot read it, no matter what.

How do you send an encrypted message to someone who does not use PGP?
You need his public key to do that.

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Re: [Enigmail] Using Enigmail for mailing lists

2014-03-16 Thread Olav Seyfarth
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Hash: RIPEMD160

Hi Boris,

 me and some friends of mine want to exchange encrypted emails on our 
 mailing list. Does enigmail support encryption for multiple recepients?
 How would you encrypt information on a mailing list?

I know of three ways to achieve this: either request anyone joining to provide
his/her key to the list master who in turn merges all received keys in some
keyring that is redistributed to all members - or by using one shared key.
In general, both only work with smaller groups. In the first case, all members
need to regularly redownload the current list-public-keyring and adopt their
per-receipint rules. In the latter case, you need to trust each member to
redistribute the key (and not being haked).

In your case it seems to be a smaller group. *If* all members have the ability
to define rules such as Enigmail can, there is a third way: you import the pub
keys of all members and define a per-receipient rule Encrypt all messages to
list-address to the following keys: member1, member2,  That works
well at least for our internal Enigmail team list address ;-)

Olav
- -- 
The Enigmail Project - OpenPGP Email Security For Mozilla Applications
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Re: [Enigmail] What about PGP/Header support?

2014-03-16 Thread Phil Stracchino
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Hash: SHA256

On 03/16/14 08:21, Jean-David Beyer wrote:
 On 03/15/2014 02:28 PM, Egbert van der Wal wrote:
 I actually see encryption as less of an issue. When I send an 
 encrypted message to someone, I need to know for sure that the 
 recipient knows about PGP encryption and knows how to decode it.
 If I send an encrypted message to someone who does not use PGP,
 he/she cannot read it, no matter what.
 
 How do you send an encrypted message to someone who does not use
 PGP? You need his public key to do that.

Exactly.  How are you going to send an encrypted message to someone
who does not have a public key?  You can't.  Period.  Unless you
separately arrange a symmetric encryption key to use or pre-arrange to
send a symmetric encryption key out-of-band.  It's a non-issue from
the point of view of Enigmail.  If you *can* send someone an encrypted
message, you have their public key.  If they don't have one, you don't
have it either, and you can't.  End of story.


- -- 
  Phil Stracchino
  Babylon Communications
  ph...@caerllewys.net
  p...@co.ordinate.org
  Landline: 603.293.8485
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Re: [Enigmail] What about PGP/Header support?

2014-03-16 Thread Egbert van der Wal
Oh, I most definitely can send an encrypted message to anyone. The
recipient will not be able to decrypt it since I don't have his public
key so I'll have to use some random other key, but I can send him an
encrypted message.

Anyway, these things confirm my point: the way the PGP signature is
transfered is only relevant for signed but unencrypted mails as you may
as well send these mails to people that do know know, understand or use
PGP. And those people may get confused by the way that the signature is
transfered: either inline or as an attachment. Embedding this in the
header solves this issue. Of course, it will require further
specification in an RFC and it will require more broad support than from
just one client (although I personally don't know anyone that does use
PGP and does not use Enigmail to do so but that's just my personal
circle, of course). But it has to start somewhere, right?

Regards,

Egbert


On 03/16/2014 08:22 PM, Phil Stracchino wrote:
 On 03/16/14 08:21, Jean-David Beyer wrote:
  On 03/15/2014 02:28 PM, Egbert van der Wal wrote:
  I actually see encryption as less of an issue. When I send an
  encrypted message to someone, I need to know for sure that the
  recipient knows about PGP encryption and knows how to decode it.
  If I send an encrypted message to someone who does not use PGP,
  he/she cannot read it, no matter what.

  How do you send an encrypted message to someone who does not use
  PGP? You need his public key to do that.

 Exactly.  How are you going to send an encrypted message to someone
 who does not have a public key?  You can't.  Period.  Unless you
 separately arrange a symmetric encryption key to use or pre-arrange to
 send a symmetric encryption key out-of-band.  It's a non-issue from
 the point of view of Enigmail.  If you *can* send someone an encrypted
 message, you have their public key.  If they don't have one, you don't
 have it either, and you can't.  End of story.



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