TCS certificate service

Securing its digital communication channels and related equipment with digital certificates

Info! On Saturday 2 March 2024 – 10 a.m. (9.00 a.m. UTC), maintenance planned by Sectigo - supplier for the TCS certificate service - will impact TCS operations for all National Research and Education Network (NREN) accounts across Europe – including Restena, being the NREN for Luxembourg.
➔ During that day, no action will be possible via your account on the Sectigo Certificates Manager (SCM, "") platform.
➔ The service will be operational again once the test has been completed.

Challenges and features

With the spread of spam, phishing, and identity theft, the security of digital communication channels and related equipment has become essential. Adequate protection from such threats is available to everyone with digital certificates. Luxembourg's research and education community is committed to countering these threats and the Restena Foundation offers protection through different types of digital certificates. 

As part of its TCS certificate service, the Restena Foundation offers users, individuals, as well as institutions, 4 types of certificates for most common software (web browsers, e-mail clients, smartphones, etc)

Certificates for individuals

Any individual working in one of the establishments connected to the RESTENA network may use certificates for individuals (clients certificates). These certificates allow them, for example, to be authenticated for a service, to digitally sign documents and messages, and also to exchange information securely online.

Certificates for institutions

Server certificates (SSL/TLS)

Certificates allowing the institution to be authenticated as the owner of its server(s), ensuring the confidentiality and security of electronic exchanges in every communication between their server(s) and external server(s) or web browsers. Visual indicators in the navigation bar, such as a padlock symbol and "https", confirm to the user that their browsing session is secure

Signature certificates for items/code

Certificates allowing the institution to sign its own software and applications and authenticating them as their author

Signature certificates for documents

Certificates allowing the institution to authenticate documents and to be identified as its author. This digital signature is the equivalent of a similar conventional agreement signed by hand.


The TCS service offered by the Restena Foundation is based on a contract between the GÉANT organisation managing the pan-European research network and the American certification authority Sectigo for the benefit of research networks (NREN). As an NREN, the Restena Foundation provides, on request, electronic certificate services to all of the connected establishments as well as to their individual users.

How to benefit?

I represent an institution and I would like to obtain certificates on its behalf:

All certificate requests are submitted on the Sectigo Certificates Manager (SCM) platform.

Important! A prior subscription to the TCS service via the Restena Foundation is required:

  1. Fill in the Trusted Certificate Service (TCS) subscription form setting out the terms and conditions of use providing your organisation's official name, the list of authorised persons validating and revoking certificate requests (administrators).
  2. Send the completed form to the Restena Foundation, which will then process and validate your request, then open a section for your organisation on the Sectigo Certificates Manager (SCM) platform (Recommendation: At the same time, we recommend that you check, in your domain names, that your administrative contacts registered for your servers are up to date and, if not, to update them in order for Sectigo to validate your eligibility)
  3. Once this step has been completed, the person listed as the "Administrative Contact 1" in the TCS service subscription form will receive an e-mail inviting him to complete the institutional profile and, in particular, set a password. 
  4. Once the account is set up, you can connect to it on the Sectigo Certificates Manager (SCM) platform.

I am an individual user with an e-mail address and I would like to obtain a client certificate:

  1. Get connected on the RESTENA Sectigo portal
  2. Log-in with "RESTENA Users" 
  3. You will then directly access the single sign-on authentication page entitled 'GÉANT Trusted Certificate Service (TCS)' where you will be invited to identify yourself by entering your RESTENA ID and password.
  4. After clicking on "Identify yourself", you will access the Sectigo certificate request page. Select the ‘GÉANT Personal Certificate’ (IGTF profiles are not available) certificate profile and choose a passphrase for the private key.
  5. Your confirmed request will then be submitted for Sectigo’s consideration and approval.
  6. Once approved, you will receive an e-mail from Sectigo with a link allowing you to download your personal certificate.

More details on the service

Who can benefit?

Higher, Secondary, and Primary Educational Establishments, Special Education, Vocational and Adult Training Centres, Research Institutes, Cultural Institutes, Museums, Ministries

Assistance and support

Please refer to the various guides published in the Sectigo Knowledge Base or contact our helpdesk.


Other services that might be of interest to you

Have a question?

  • Faq
  • As a teacher, can I obtain a client certificate?

    Yes. As a teacher in Luxembourg with an e-mail address ending in, you are an individual user of the Restena Foundation services. As such, you can obtain client certificates.

  • How is the validation process organized to benefit from the TCS certificate service?

    1. The interested eligible institutions have first to return by e-mail to the Restena Foundation the duly completed TCS service subscription form
    2. Upon receipt of this document, the Restena Foundation processes and validates the request, and then creates an entry for the interested organisation on the Sectigo Certificates Manager (SCM) platform . The validation of the organisation name and address is performed by Restena Foundation at this stage.
    3. The Restena Foundation contacts the future administrators of the institution with an initial password to the SCM platform, which has to be changed on first login
  • How can I subscribe to the TCS certificate service?

    • If you would like to subscribe to the TCS certificate service on behalf of your institution complete and send the TCS service subscription form by e-mail to
    • If you benefit from the Restena Foundation services, and would like to get a client certificate, please send an email to A more automated procedure is currently being prepared.
  • Does a single sign on (sso) solution exist to access to the TCS certificate manager interface?


  • Is there any user manual available to guide me through the TCS certificate manager interface?

    Of course, the certification authority Sectigo has published a very complete knowledge base: the Sectigo Knowledge Base. As a first step, we advise you to have a look at the Sectigo® Certificate Manager Quick Start Guide.

  • I have subscribed in the TCS certificate service but how long will it take to activate my account?

    There is no defined duration to activate your TCS certificate service, but a few working days need to be anticipated.

  • My institution wants to subscribe to the TCS certificate service, which name and street address is best to choose to pass validation?

    • If your institution is registered in the Trade and Company Register (Registre de Commerces et des Sociétés), please use that exact name and address.
    • If your organisation is a public institution, please use the exact name and address as stated on the Public Service Directory (L’annuaire des sites internet public luxembourgeois).
  • Why can I not find a subscription form to the TCS certificate service in English language?

    The TCS Subscriber form is a legally binding document and it is only available in French language.

  • What kind of certificates can I get through the TCS certificate service?

    • If you represent an institution and would like to obtain certificates on its behalf, you can request for 3 types of certificates: server certificates (SSL/TLS), signature certificates for items/code signing and signature certificates for documents.
    • If you are an individual user in the institution, you can obtain a client certificate.
  • What if my own organisation is working on behalf of other organisations and would like to make them benefit from TCS certificates?

    In this scenario, the Restena Foundation is alone empowered to create all the concerned organisations and make them manageable by your own organisation. Please contact us at

  • Who can benefit to the TCS certificate service?

    The TCS certificate service is to the benefit of Luxembourg institutions operating in the sectors of education, research, culture and administration as well as to any individual users of those institutions.

Haven't found the information you needed?