DGS&D CERT is a Digital Signature Certificate that is equivalent to a digital identity, which helps to uniquely identify you to the DGS&D portal on the Internet. A Digital Signature is to an electronic form what a handwritten signature is to a paper form.

For security reason your DGS&DCERT should be stored on a hardware device such as a cryptographic USB token. You simply need to plug the token into the USB port of your computer and perform your signing operation.