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diff --git a/misc/blog.gnupg.org/20170807-web-key-in-enigmail.org b/misc/blog.gnupg.org/20170807-web-key-in-enigmail.org
index 7e6d25f..a818251 100644
--- a/misc/blog.gnupg.org/20170807-web-key-in-enigmail.org
+++ b/misc/blog.gnupg.org/20170807-web-key-in-enigmail.org
@@ -1,88 +1,91 @@
# Using the Web Key Service with Enigmail
#+STARTUP: showall
#+AUTHOR: Kai
#+DATE: August 7, 2017
** Using the Web Key Service with Enigmail
Obtaining the public key of someone has always being a major pain point of
using GnuPG. OpenPGP doesn't "outsource" trust management by using a PKI.
Instead, it allows each user to decide whom to trust. This has the downside
that we need to evaluate whether we can trust a new public key for each
new communication partner. Until recently, there wasn't an automatic way to
securely get the public key of someone you never communicated with.
The [[https://tools.ietf.org/id/draft-koch-openpgp-webkey-service-03.html][Web Key Service]] and the new ~--auto-key-retrieve~ &
~--auto-key-locate~ available in GnuPG 2.1.19 and beyond.
*** Web Key Service
The Web Key Service is a protocol to publish public OpenPGP keys via
email and retrieve others' public keys using HTTPS. The advantage over
HKPS is that every email provider maintains its own key
server (called Web Key Directory, WKD) that is authoritative for all
its users. This means that:
1. There exists only one key server for a given email address. No need to ask
multiple servers as with HKPS.
2. When publishing a public key using mail, WKD makes sure the sender is in
possession of the secret key.
3. Email providers can (and should) make sure that only the owner of the
email account is able to publish a public key for it.
Point three helps us with trust management. In case we trust the email
provider of our communication partner, we can trust the key retrieved by WKD
more than one from an HKPS based key server.
#+CAPTION: Web key service protocol overview
#+ATTR_HTML: :style max-width: 600px
[[file:img/wks-schema.png]]
*** Publish your public key to a Web Key Directory
-In order to use WKS you need a provider who supports it. After you configured
-the email account in Thunderbird you need to enable OpenPGP for it and
-generate a key pair.
+In order to use WKS you need a provider who supports it [fn:1]. After you
+configured the email account in Thunderbird you need to enable OpenPGP for
+it and generate a key pair.
#+CAPTION: Enable the OpenPGP checkbox in the account settings.
#+ATTR_HTML: :style max-width: 600px
[[file:img/wks-account-settings.png]]
Then, open the key management window and find your public key. Right clicking
it opens the context menu. There, select the option to upload the public key
to your provider's WKD.
#+CAPTION: Context menu of the key management dialog.
#+ATTR_HTML: :style max-width: 600px
[[file:img/wks-key-mng.png]]
After submission, the WKD will send an email to you asking to confirm the
publication request. The subject line and body copy can be defined by the WKD
but Enigmail will display a yellow bar above the message announcing it is a
confirmation request. Clicking the button on the right will send the
confirmation email to WKD.
#+CAPTION: Enigmail adds a yellow bar to the confirmation request.
#+ATTR_HTML: :style max-width: 600px
[[file:img/wks-confirm-req.png]]
After the email has been sent, your public key will be accessible to
everybody.
*** Receive others public key from a Web Key Directory
Recent version of Enigmail receive missing public keys automatically form
multiple sources, including WKD. Everybody who wants to send you an encrypted
email will be able to do so without finding your public key manually first.
This is a bit anticlimactic, but you can use the ~--auto-key-locate~
option to retrieve your own public key from the WKD to see if it worked.
~HOME=`mktemp -d` gpg2 --auto-key-locate wkd -e -r <your email address>~
If GnuPG is able to retrieve the public key you will see a line that looks
like that:
~gpg: automatically retrieved '<your email address>' via WKD~
+
+[fn:1] As the time of writing only [[Posteo][https://posteo.de/en]] supports
+ WKS.
diff --git a/misc/blog.gnupg.org/img/wks-key-mng.png b/misc/blog.gnupg.org/img/wks-key-mng.png
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