The File Extensions Database

.DDOC File Extension

  • Developer by: RIA
  • Category: Encoded Files

What is an .DDOC file?

.DDOC is DigiDoc Signature File

A DDOC file is a digital document (DigiDoc) created with qDigiDoc, an open source software used to authenticate Estonian and Finnish government issued ID cards and signed documents. It contains files that have been signed by a government employee, along with the signatures related to each file, which includes the certificate, validity confirmation, and the validity confirmation service certificate.

The DDOC format is based on the ETSI TS 101 903 standard called XML Advanced Electronic Signatures (XAdES). It is developed by Riigi Infosüsteemi Amet (RIA), which is the Information System Authority of Estonia. DDOC is one of three digital signature and cryptographic file formats in the DigiDoc family, along with the .CDOC and .BDOC files.

Several versions (1.1, 1.2, and 1.3) of the DDOC format have been developed since its initial release. These versions are necessary in order to remain compatible with other digital signature systems and international standards. The DDOC format was the first generation DigiDoc format and was succeeded by the BDOC format.

NOTE: The qDigiDoc software can be used to digitally sign documents using an employee's ID card or mobile ID and can open, save, and verify documents with digital signatures. The software is open source and can be downloaded for free through the links below.

Programs that open DigiDoc Signature File

How to solve problems with DDOC files

  • Associate the DDOC file extension with the correct application. On :
    Windows: Right click on any DDOC file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.DDOC files". Mac: Right click (or Ctrl-click) the DDOC file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .DDOC is DigiDoc Signature File. Because only the current version supports the latest DDOC file format. Search, therefore, e.g. on the RIA manufacturer website after an available .DDOC is DigiDoc Signature File update.
  • To make sure that your DDOC file is not corrupted or virus-infected, get the file again and scan it with antivirus software.