Identification Based Document Authentication (AVDH)

The Identification Based Document Authentication service provides citizens with a convenient and secure solution to manage their public administration affairs.


The service provides rapid access to e-administration for all users who do not possess an electronic signature certificate, but the administrative procedure requires an electronically authenticated document. So, even a customer possessing only an electronic identification can fully participate in electronic administration by using this service.


According to Section 325 of Act CXXX of 2016 on the Code of Civil Procedure, with the AVDH service, a private deed of full probative value can be created. Witnesses’ signature is not required for the full probative value of the identified person’s AVDH-certified statement.




Keep your access to electronic identification services (for instance IDs and passwords for Client Gate or RKTA - Identification by Telephone with a Partial Code) secure. Please do not give it to anyone, as it allows for misuse (for example, concluding a contract, any administration or access to health data on behalf of the Client Gate owner).


Select a file

Upload a file you want to authenticate from your device. In the appearing window, select the file you want to authenticate.

After uploading the file, select the type of authentication, then accept the GT&C. The General Terms and Conditions for the service are available on this page.


After that, the authentication process can be initiated by clicking the “Upload” button.


File format

Before choosing a type of authentication, it is practical to orient which authentication is accepted or required by that organisation you submit the authenticated document.

With the Authentic PDF method, it is only possible to authenticate PDF files below the 20-megabyte size limit.

Larger-sized PDF documents and all other file types must be authenticated using the ASIC method, with a size limit of 200 megabytes.



The “Authentic PDF” function cannot be applied to PDF documents that are already authenticated electronically (for example, with an electronic signature/stamp or AVDH authentication). To authenticate an already authenticated PDF document, please select the “ASIC” authentication form when uploading. The ASIC format also allows the authentication of a document by multiple organisations/individuals.

A visual element is also placed in the upper right corner of AVDH-certified PDF documents, which requires the document to be at least 7x5 cm in size. Please ensure that the visual element does not obscure the content and does not deteriorate the document’s quality. In case of low resolutions, please, increase the size of the document for proper display.


The user must be identified after clicking on the “Upload button” which is performed by giving the Client Gate username and password.



After the successful identification, the AVDH system authenticates the document and makes it available for download from the website. After, authentication of additional documents is possible too.



Other information

Managing ASIC, ASICE, and ASICS file extensions

ASIC (Associated Signature Containers) is a so-called container data format based on international standards, which combines electronic documents, their characteristics and the electronic signatures associated with them into a single file. In an ASIC container, any document or data can be placed. The ASIC container also provides the ability to sign and time-stamp data electronically that was not initially prepared for it.

The ASIC container can be managed as a ZIP compressed archive openable by any ZIP format-supporting programs (such as file managers) or newer Windows operating systems. For Windows, a suitable file manager program is required, such as 7-Zip, FAR Manager, FreeCommander, or Total Commander. On an Android-based mobile device, Total Commander, Astro File Manager, Solid Explorer, and for an iOS system, Readdle Documents 5 or iZip are suitable.

The parameters for managing archives must be specified in these programs’ settings, so files with the .asice (or .asics) extension can be opened as ZIP archives.

In case you do not find or do not intend to change these settings, it is also possible to make a .zip copy of the .asice (or .asics) file and open it with a program suitable for ZIP formats.

The file extension, briefly the extension, helps the operating system and the user programs to identify the file type. The extension is located at the end of the file name, separated from it by a period. For example, “abcd.docx” means a Word document named abcd, “abcd.asice” means an ASIC container named abcd, and “” means a ZIP compressed archive named abcd. When double-clicking a file to open it, the operating system (such as Windows) scans the file extension. If it recognises the extension, it opens the file in the program associated with that file extension.

With the  Governmental Electronic Signature Authentication Service available for free of charge, it is possible to browse ASIC containers without modification. The installation package of the application and a detailed guide with pictures can be found by clicking here: