Start article on gpg cardsgpg_cards

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diff --git a/source/desktop/gpg_cards/index.rst b/source/desktop/gpg_cards/index.rst
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+***********
+ GPG Cards
+***********
+
+Card setup
+==========
+
+Settings
+--------
+
+The initial setup of a new card involves changing the settings.
+
+Enter the command interaction mode of gpg with the command ``gpg
+--card-edit``.
+
+Then enter admin mode and change the name::
+
+   gpg/card> admin
+   Admin commands are allowed
+
+   gpg/card> name
+   Cardholder's surname: <Surname>
+   Cardholder's given name: <Name>
+
+you will have to enter the admin PIN; your card will have details on the
+default.
+
+optionally also change other options::
+
+   gpg/card> lang
+   Language preferences: en
+
+   gpg/card> url
+   URL to retrieve public key: <URL for your public key>
+
+   gpg/card> login
+   Login data (account name): <your login name>
+
+   gpg/card> salutation
+   Salutation (M = Mr., F = Ms., or space):
+
+and quit to save the data on the card::
+
+   gpg/card> quit
+
+Moving the subkeys to the card
+------------------------------
+
+In this step the subkeys currently on the computer will be moved to the
+card *and removed from the PC*. Please make sure that you have an
+(offline) copy elsewhere, as they can't be recovered from the card.
+
+Enter the key editing mode with ``gpg --edit-key <your_key_id>`` and
+select the subkey with ``usage: S``, transfer it to the card and then
+toggle it again to unselected::
+
+   gpg> key 2
+   gpg> keytocard 
+   Please select where to store the key:
+      (1) Signature key
+      (3) Authentication key
+   Your selection? 1
+   gpg> key 2
+
+Then 
+
+Changing the PINs
+-----------------
+
+This is done last, because on some cards it is necessary to have a key
+on the card before the PINs can be changed from the defaults.
+
+To change the PINs, enter again the command interaction mode of gpg with
+the command ``gpg --card-edit``, and change first the admin PIN and then
+the PIN::
+
+   gpg/card> admin
+   Admin commands are allowed
+
+   gpg/card> passwd
+   gpg: OpenPGP card no. D276000124010200FFFFFFFFFFFF0000 detected
+
+   1 - change PIN
+   2 - unblock PIN
+   3 - change Admin PIN
+   4 - set the Reset Code
+   Q - quit
+
+   Your selection? 3
+   PIN changed.
+
+   1 - change PIN
+   2 - unblock PIN
+   3 - change Admin PIN
+   4 - set the Reset Code
+   Q - quit
+
+   Your selection? 1
+
+Gnuk
+====
+
+For the Gnuk the default PINs are 123456 and 12345678 for the Admin PIN.
+
+Changing the PIN before the Admin PIN will enter a custom Admin less
+mode where the Admin PIN is the same as the PIN: in this case the lenght
+should be at least 8 characters, and there won't be an option to unlock
+a card after getting the PIN wrong 3 times.
+
+See also
+========
+
+* https://web.archive.org/web/20150502182337/http://nodonogard.blogspot.com/2014/08/writting-gnuk-binary-to-fst-01-using-st.html
+* https://www.earth.li/~noodles/blog/2017/02/gnuk-on-maple-mini.html
+* https://www.earth.li/~noodles/blog/2015/08/program-fst01-with-buspirate.html
+
+..
+   vim: set filetype=rst: 
diff --git a/source/desktop/index.rst b/source/desktop/index.rst
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--- a/source/desktop/index.rst
+++ b/source/desktop/index.rst
@@ -7,3 +7,4 @@
    :caption: Contents:
 
    command_line_printing/index
+   gpg_cards/index