[Enigmail] Key selection

[Faramir]

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Jakub 'Livio' Rusinek escribió:
> On 21.11.2008 20:09, Faramir wrote:
>> I think you can solve that problem in Tools->Accounts
>> Settings->OpenPGP Security. You can select the KeyID you want to use
>> with your email account. I hope it will solve your problem...
> 
> I have selected key there, but look at OpenPGP → Default Composition
> Options → Key Selection Options.
> 
> I can't choose one key for all people.

   Maybe I am wrong, but I think you misunderstood how OpenPGP works...
(or maybe I misunderstood what you want to do). I saw a message where
you say you have both private and public key, and that is right, you
have them... but those are _your_ keys. To send an encrypted message,
you _need_ the recipient's public key (that is the reason why they are
"public").

   There are lots of manuals and FAQs and even wikipedia articles
talking about how does public key encryption work... But since I can't
remember right now where to find those FAQs (enigmail website, and GnuPG
website are good places to look for FAQs), I will try to explain it...
but keep in mind I am not an expert, so maybe I will do some mistakes...

  Lets suppose you want to receive letters from me, in a way nobody can
read them before they arrive to your hands... so you buy some small
chests, and also some padlocks, you open the padlocks, and send me both
the chests and padlocks to me. But you _don't_ send me the keys.

  Now, all I have to do is to write a letter, put it inside a chest, and
use a padlock to close the chest. Now nobody but you can open the chest
to retrieve the letter, not even me can do it. So I deliver the chest to
you. You take the chest, pick the key and open the padlock, and retrieve
the letter.
  The open padlocks are your "public key", the thing I need to send you
an encrypted message, and the padlock key is your "private" key, the
thing you need to decrypt the messages.

  So, when you want to compose a message, and encrypt it, you need to
select (enigmail will do it for you) the public key of your intended
recipient... if I send you a letter using Olav's public key, you won't
be able to open it, right? That's the reason why you can't use a single
key to compose encrypted messages...

  In my previous message, I thought you wanted to use your private key
with multiple email address (to sign the messages, and to decrypt the
encrypted messages you receive), so the instructions I gave you were for
that purpose...

  Read the Enigmail's FAQ and instructions, and if something doesn't
work as expected, I am sure people in the list will help you to solve
the problem. Also, if you want, we can send you an encrypted message to
check it is working...

  Best Regards
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