FAQEU eIDAS

What is a QWAC under eIDAS?

A QWAC is a qualified certificate for website authentication: it links a website to the natural or legal person named in the certificate and must be issued by a qualified trust service provider under eIDAS.

Use this FAQ to separate the legal qualified-certificate status from ordinary TLS deployment, trusted-list checks, browser recognition duties, and the evidence needed before relying on a QWAC.

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Author
Sorena AI
Published
May 9, 2026
Updated
May 9, 2026
Questions
3

Structured answer sets in this page tree.

Primary sources
13

Cited legal and guidance references.

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Sorena AI
Published May 9, 2026
Updated May 9, 2026
Overview

Under eIDAS, a QWAC is not just a normal website TLS certificate with a compliance label. It is a qualified certificate for website authentication, issued by a qualified trust service provider and containing the identity, domain, validity, issuer-signature, and status-service information required for that certificate type.

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3 of 3 questions
Question 1

What does a QWAC prove under eIDAS?

A certificate for website authentication makes it possible to authenticate a website and link that website to the natural or legal person to whom the certificate is issued. A QWAC adds the eIDAS qualified layer: the certificate must be issued by a qualified trust service provider and meet Annex IV requirements.

For a website owner or relying party, the useful question is not only whether the TLS connection works. The QWAC evidence should show who the certificate identifies, which domain names are covered, which qualified trust service provider issued it, and where relying parties can check certificate validity or revocation status.

  • Confirm that the certificate is explicitly indicated as a qualified certificate for website authentication.
  • Check that the subject identity, address elements, and domain names match the website or service being authenticated.
  • Record the certificate validity period, serial or certificate identity code, issuer, and status-service location.
  • Treat QWAC evidence as website identity evidence, not as proof that the whole transaction, application, or message payload has been sealed or signed.
Citations
Question 2

How should a relying party validate a QWAC?

Validation should combine certificate checks with eIDAS status checks. First confirm that the issuer and service are qualified for the relevant trust service on an EU trusted list, because eIDAS allows a qualified trust service provider to provide a qualified trust service after qualified status appears in the trusted lists.

Then validate the certificate itself: domain match, certificate chain, validity period, certificate-status endpoint, revocation status, and the QWAC-specific qualified-certificate statements. eIDAS requires qualified trust service providers issuing qualified certificates to publish revocation status and provide validity or revocation information to relying parties.

  • Use the EU and national trusted-list information to confirm the QTSP and qualified service status.
  • Check the website domain against the certificate's domain-name information before treating it as the authenticated endpoint.
  • Use the certificate validity-status service, such as the CRL or OCSP location identified in the certificate profile, before relying on the certificate.
  • Keep validation logs that show the certificate examined, trusted-list result, revocation or validity status, validation time, and any exception decision.
Citations
ETSI TS 119 612 - Trusted Lists

Specifies trusted-list structure and service information used by validators to interpret qualified trust service provider and qualified service status.

Question 3

What changed for browsers and QWACs under eIDAS 2?

The eIDAS 2 amendments add browser-facing duties for qualified certificates for website authentication. Providers of web browsers must recognise QWACs issued in accordance with Article 45 and display the identity data and additional attested attributes in a user-friendly way, subject to the small-enterprise exception stated in the Regulation.

That browser rule should not be read as a guarantee that every deployed browser, user interface, certificate store, or relying-party application already presents QWAC identity information in the same way. For implementation work, keep the distinction clear: the certificate may satisfy eIDAS QWAC requirements, while browser support and display behavior are separate deployment and interoperability checks.

  • For website owners, confirm whether the intended browser and client environment recognises and displays the QWAC identity information needed for the user journey.
  • For relying-party systems, do not rely on browser display alone; keep machine-readable validation evidence for issuer, service status, certificate status, and domain match.
  • For incidents, remember that eIDAS allows browser precautionary measures only for substantiated concerns about security breaches or loss of integrity of an identified certificate or set of certificates.
  • For procurement, ask certificate providers how the QWAC profile, trusted-list status, revocation publication, and renewal process will be evidenced.
Citations
Recommended next step

Turn QWAC validation into a reusable evidence pack

Sorena can help structure QWAC checks around the certificate, QTSP trusted-list status, revocation evidence, browser assumptions, and renewal ownership without treating a normal TLS certificate as eIDAS-qualified.

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Ask source-linked questions about QWACs, qualified trust service providers, trusted lists, and validation evidence using the cited sources on this page.

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Primary sources

References and citations

ETSI EN 319 412-4 - certificate profile for website authentication
etsi.org
Referenced sections
  • Explains the website-certificate profile for TLS-accessed websites, useful for distinguishing website authentication from other eIDAS certificate purposes.
"certificate profile for web site certificates that are accessed by the TLS protocol"
ETSI EN 319 412-4 - website certificate profile
etsi.org
Referenced sections
  • Technical profile source for website certificates accessed through TLS, used to explain the website-authentication layer without treating QWAC as a substitute for seals or signatures.
"Certificate profile for web site certificates"
ETSI EN 319 412-5 - certificate type QCStatement
etsi.org
Referenced sections
  • Supports the distinction between website-authentication certificates, electronic-signature certificates, and electronic-seal certificates through certificate-type QCStatements.
"electronic signature, electronic seal or web site authentication"
ETSI EN 319 412-5 - QCStatements
etsi.org
Referenced sections
  • Technical certificate-profile source mapping eIDAS Annex IV QWAC requirements to certificate fields and QCStatements.
"EU qualified certificates for website authentication"
ETSI EN 319 412-5 - QCStatements for EU qualified certificates
etsi.org
Referenced sections
  • Maps eIDAS Annex IV QWAC requirements to certificate-profile fields, including qualified-certificate indication, subject identity, domain names, validity, serial number, and status-service locations.
"Mapping with Annex IV of Regulation (EU) No 910/2014"
ETSI TS 119 612 - Trusted Lists
etsi.org
Referenced sections
  • Specifies trusted-list structure and service information used by validators to interpret qualified trust service provider and qualified service status.
"Trusted Lists"
Regulation (EU) No 910/2014 (eIDAS)
eur-lex.europa.eu
Referenced sections
  • Primary legal source for QWAC definitions, Annex IV content, trusted lists, QTSP qualified status, and certificate validity or revocation-status duties.
"qualified certificate for website authentication"
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