2. Configure Timestamp Server
While your personal certifacte suffices to show that you created a signed document it is not able to provide any security against tampering at a later date. You can mitigate this by using a Timestamp-Service to provide your signed document with a timestamp. Therefore one can easily assess whether or not a singed document was unknowingly changed afterwards by comparing the timestamp from the signature to the last modified date of the document.
The DFN-Verein provides its own Timestamp-Service.
1. Navigate on the menu-bar to 'Edit' -> 'Preferences' and select the category 'Signatures' on the left hand side of the window. Find 'Document Timestamping' and click 'More...'.
2. Choose 'Time Stamp Servers' and click on the plus symbol to add a new time stamp server. [Picture 1].
In the newly poped up window 'New Time Stamp Server' enter a name for the server e.g. 'DFN', enter 'http://zeitstempel.dfn.de' as the Server URL and finnaly confirm the settings by clicking 'OK' [Picture 2]
Now you should see the time stamp server successfully added to the list of timestamp servers. You can then set this time stamp server as default by selecting the entry and choosing 'Set Default' [Picture 3]. You will now see a star symbol next to the selected entry [Picture 4].
3. Now close the 'Server Settings' window.
4. Select the category 'Signatures' on the left hand side of the window. Find 'Verification' and click 'More...'.
5. Select 'Secure time (timestamp) embedded in the signature' under 'Verification Time' and confirm your selection with 'OK'.
If you have any questions or problems, please contact the RRZK-Helpdesk