The most important area of application of the ID-card as well the digi-ID, Mobiil-ID and an institution's digital stamp is to give digital signatures.
Using digital signatures is convenient and fast as it allows one to electronically and without using any paper perform the actions for which one previously had to give a signature on paper. Digital signatures are also very secure as it cannot be forged and the correctness thereof is thereby ensured.
Pursuant to the Digital Signatures Act, only signatures with a valid certificate as of the moment of giving the signature are valid. The validity of the certificate can be quickly and conveniently checked with the help of the validity verification service.
The cooperation of three components is required for giving online signatures with the ID-card:
- the signature plug-in that is loaded in the user’s browser and communicates with the ID-card;
- the web application providing the possibility for digital signature;
- DigiDocService (or DigiDoc libraries) with which the web application communicates during signing and with the main functions thereof being forming the signed container (DigiDoc container) and performing a query as to the validity information of the certificate of the signatory.
For checking the validity information of certificates in real-time, the validity verification service of AS Sertifitseerimiskeskus must be used. The service ensures secure electronic personal identification and gives digital signatures their legal effect.