diff --git a/external/exchange-channels/duma.md b/external/exchange-channels/duma.md
index f4b2a8257237f2cbac760cf874c12bb0ee96dda9..92c03b8c12bec9ed1ea649ca55e4f3fe352f56ff 100644
--- a/external/exchange-channels/duma.md
+++ b/external/exchange-channels/duma.md
@@ -59,6 +59,16 @@ In the following steps we provide instructions on how to use DUMA web interface.
 5. At any time you can launch **IBM Aspera Connect** to display the status of uploads to or downloads from your computer. <br/>
   ![Alt](duma_8.png "Title") 
 
+
+
+6. All data are encrypted on server side and they stay encrypted also upon download. For decryption, you have to navigate into your **IBM Aspera Connect** window and click "**Unlock encrypted files**". <br/>
+  ![Alt](duma_9.png "Title") <br/>
+You will be prompted for encryption passphrase which you should already have received from the repository administrator. <br/>
+  ![Alt](duma_10.png "Title") <br/>
+Encrypted files are by default kept on your disc after decryption. If you want to change this behaviour, navigate to Options->Settings and check "Delete encrypted files when finished" box. 
+
+
+
 <a name="DUMA_CLI"></a>
 ## Accessing DUMA via Command-Line Tool
 In the following steps we describe instructions on how to use DUMA web interface.