Feature: Add page about encrypted names/decrypt name feature (#79)

Author: infeo

source/desktop/accessing-vaults.rst

@@ -55,7 +55,7 @@ Click on ``Reveal Drive`` in the Cryptomator window to open the mount location u
 
      Even though your files are shown unencrypted in the virtual drive, they are not stored unencrypted on the hard drive but only in `volatile memory <https://en.wikipedia.org/wiki/Volatile_memory>`_
 
-.. image:: ../img/desktop/vault-detail-unlocked.png
+.. image:: ../img/desktop/vault-detail-unlocked-simple.png
     :alt: Cryptomator window showing an unlocked vault
 
 .. note::

source/desktop/encrypted-file-names.rst

@@ -0,0 +1,73 @@
+Encrypted File Names
+====================
+
+.. note::
+
+    Neither file name nor directory structure encryption can be disabled.
+
+Cryptomator protect your files by not only encrypting their content, but also their names and the overall directory structure of the vault.
+For example, if you have a directory structure inside your vault like this:
+
+.. code-block:: console
+
+    .
+    ├─ myProject.pptx
+    ├─ Images for Project
+    │  └─ ImageOfBees.jpg
+    └─ ...
+
+The actual directory structure of the vault on your hard drive/cloud will look like this:
+
+.. code-block:: console
+
+    .
+    ├─ d
+    │  ├─ BZ
+    │  │  └─ R4VZSS5PEF7TU3PMFIMON5GJRNBDWA
+    │  │     ├─ dirId.c9r  # internal vault file
+    │  │     ├─ 5TyvCyF255sRtfrIv**83ucADQ==.c9r  # myProject.pptx
+    │  │     └─ FHTa55bH*sUfVDbEb0gTL9hZ8nho.c9r  # Linking entry for directory "Images for Project"
+    │  │        └─ dir.c9r  # contains information for the link
+    │  └─ FC
+    │     └─ ZKZRLZUODUUYTYA4457CSBPZXB5A77  # content of the directory "Images for Project"
+    │        └─ 4lmrQYfE_5ETusEkVJlTJrcFzjwxNBymig==.c9r # ImageOfBees.jpg
+    ├─ masterkey.cryptomator
+    ├─ masterkey.cryptomator.DFD9B248.bkup
+    └─ vault.cryptomator
+
+
+While this increases security, it also makes it impossible to see the original file names and directory structure without decrypting them first.
+When you need to know the original name of a file (e.g. to restore an older version), you can use the ``Decrypt file name`` feature to decrypt the file name.
+
+
+.. _desktop/encrypted-file-names/decryption:
+
+Decrypting File Names
+---------------------
+
+.. note::
+
+    Due to technical reasons, Cryptomator can only decrypt the filen name given an encrypted file .
+    It cannot compute the path inside the vault to the file.
+
+You can access this feature from the unlocked view of a vault in the Cryptomator main window.
+On the bottom of the unlocked view, drop files on the "Decrypt file name" zone or click on it.
+A modal window with the encrypted-decrypted-mapping opens.
+
+.. image:: ../img/desktop/vault-detail-unlocked.png
+    :alt: Vault detail view in the unlocked state
+
+The encrypted-decrypted-table has an action bar at the top with two buttons:
+* Clipboard button to copy the whole table as a CSV into the system clipboard
+* Trash button to clear the table
+
+.. image:: ../img/desktop/decrypt-file-names.png
+    :alt: Decrypt file names window
+    :scale: 63%
+    :align: center
+
+Encrypted file names and their corresponding decrypted, original name are shown inside a two column table, with the encrypted names on the right.
+If you have not dropped any files, the table is empty.
+You can click inside the empty table to select files with a file picker dialog.
+
+Once the table has content, you can select single cells and copy their content with the OS specific keyboard copy shortcut.

source/img/desktop/decrypt-file-names.png

@@ -25,6 +25,7 @@ If you are interested in the security of Cryptomator, have a look at our :ref:`s
    desktop/accessing-vaults.rst
    desktop/password-and-recovery-key.rst
    desktop/vault-management.rst
+   desktop/encrypted-file-names.rst
    desktop/volume-type.rst
    desktop/error-handling.rst
    desktop/sync-conflicts.rst