moved_download_page_to_accessing_data_page

user_docs/user_stories/accessing_data.md

@@ -10,4 +10,57 @@
     Please note the GHGA is not responsible for deciding of data access requests as this is a responsibility of [Data Access Committee](../glossary/glossary.md#data-access-committee-dac) installed by the the [research data controller](../glossary/glossary.md#research-data-controller-rdc). In case you do not receive notifications about the decision on your request, please first contact the DAC as indicated on the [dataset details page](../user_stories/browsing_data.md#dataset-details)
 
 ## Data Download
-For further details on how to access data, please refer to the [Data Download](data_download.md) documentation.
+
+Downloading data from datasets you have been granted access to is a two stage process:
+
+* The download is prepared through the *Data Portal*. The corresponding dataset
+  is selected and the download potentially restricted to individual files from
+  the dataset. At the end of this process, a download token is generated and
+  shown to the user.
+
+* Subsequently, the CLI tool [GHGA Connector](../cli_tools/connector.md) is used
+  to perform the actual file download using the previously generated download
+  token and the user's Crypt4GH key pair.
+
+### Prerequisites
+
+To perform a file download from GHGA, users are required to have genreated a
+Crypt4GH keypair. The public key will be used to encrypt both the download token
+and the actual files that are downloaded. For information on how to generate a
+Crypt4GH keypair please refer to the official [Crypt4GH
+documentation](https://crypt4gh.readthedocs.io/en/latest/).
+
+### Download Preparation
+
+After a user has been granted access to a dataset, the user initiates a data
+download by creating a download token in the Data Portal. A single download
+token can be generated to download either a single or multiple files from a
+dataset. The download token is then passed on to the CLI tool GHGA Connector to
+perform the actual download.
+
+1. Navigate to the [GHGA Data Portal](https://data.ghga.de/).
+
+2. Visit your profile page to see the datasets you have access to.
+
+    ![Dataset access link](../assets/img/dataset-link.png){ width="500" }
+
+3. Navigate to the dataset list and select your dataset of interest to be downloaded.
+
+    ![Select dataset](../assets/img/dataset-select.png){ width="500" }
+
+4. Fill the form with the necessary information in order to create a download
+token. Specifying one or multiple file IDs is optional, if not information is
+provided the entire dataset will be downloaded. A Crypt4GH public key must be
+provided before submitting the form.
+
+    ![Token form](../assets/img/token-form.png){ width="500" }
+
+
+### Download using GHGA Connector
+
+The GHGA Connector is a command-line tool that facilitates interaction with the
+file storage infrastructure of GHGA. Data downloading is carried out using the
+GHGA Connector.
+
+For further information on how to use the command-line tool, please refer to the
+[GHGA Connector](../cli_tools/connector.md) documentation.