Extended Validation Digital Certificate (Server) with “Multi-domain” feature

Extended Validation (EV) Digital Certificate (d-Cert) (Server) with “Multi-domain” feature provides the highest level of SSL/TLS encryption for multiple server names through a rigorous validation process. This process verifies the applicant’s control over the relevant domain names, the legal legitimacy of the organisation, and its physical and operational existence, in accordance with the Extended Validation Guidelines published by the CA/Browser Forum.​

​The d-Cert enables secure HTTPS connections for up to 50 server names across multiple distinct domains owned by the Subscriber Organisation, removes “Not Secure” warnings displayed by web browsers, and delivers maximum data protection together with superior user trust. It is offered with a one‑year subscription period.​

​During the one‑year subscription period, subscribers may obtain an unlimited number of new d-Certs (Server) under the same application at no additional charge. The validity period of each newly issued certificate will be subject to either the phased maximum validity period or the remaining subscription period, whichever is shorter.​

​Example​

An EV d-Cert (Server) with the “Multi‑domain” feature may be used to secure the following server names across different domains:​

  • www.hkca.hk
  • hkca.hk
  • www.hkirc.hk

Notes:

  1. An EV d-Cert (Server) with the “Multi‑domain” feature identifies one server name by default. Where more than one, but no more than 50, server names are required, all additional server names must be specified in the application, and an additional subscription fee applies per additional server name.
  2. Wildcard characters (i.e. the asterisk “*”) are not permitted as part of any server name.​
  3. All server names are fixed upon issuance and cannot be changed thereafter.​
  4. The certificate includes digital signature key usage, the Subject Alternative Name (SAN) field, and the Extended Key Usage field. For details, please refer to Appendix B of the Certification Practice Statement (CPS).​
  5. Digital signatures supported by the EV d-Cert (Server) with the “Multi‑domain” feature are intended solely for server authentication and the establishment of secure communication channels. They must not be used for contract negotiations, legally binding agreements, or monetary transactions.

Eligibility for EV d-Cert (Server) with “Multi‑domain” Feature​

​An EV d-Cert (Server) with “Multi‑domain” feature is intended for organisations and businesses that operate multiple domain names and require the highest level of trust and identity assurance across all their websites. It involves rigorous verification of the organisation’s legal and operational identity and enables multiple domains to be secured under a single digital certificate.​

​This certificate is suitable for organisations providing high‑value, sensitive, or transaction‑based online services across multiple domains, such as e‑commerce platforms, banking and financial services, payment systems, and large‑scale enterprise websites, where consistent and maximum trust is essential.​

Document required for the EV d-Cert (Server) application

  • Copy of proof of ownership of all the applied domain name(s) to be included in the certificate

If the Applicant is a company registered in Hong Kong :

  • Copy of Business Registration Certificate issued by the Inland Revenue Department
  • Copy of Certificate of Incorporation / Certificate of Registration issued by the Companies Registry (applicable to limited companies)
  • Completed, signed and stamped Authorisation Letter designating the authorised representation

If the Applicant is a bureau or department of the HK SAR Government :

  • A memo signed by the Departmental Secretary (or staff at equivalent rank or above) and endorsed with department chop designating the Authorised Representative

If the Applicant is statutory body in Hong Kong :

  • Copy of the ordinance(s) under which the statutory body was established
  • Completed, signed and stamped Authorisation Letter.

 

​Benefits of Using EV d-Cert (Server) with “Multi‑domain” Feature​

The use of an EV d-Cert (Server) with “Multi‑domain” feature enables organisations to encrypt data transmitted between users and servers using standard SSL/TLS technology while providing the highest level of identity assurance through comprehensive verification procedures. It allows users to clearly identify and authenticate the verified organisation behind each protected website, delivering enhanced credibility and confidence across all domains.​

​In addition, an EV Multi‑domain d-Cert (Server) simplifies certificate management by securing multiple domains under one certificate, ensures consistent high‑assurance protection across all online services, and demonstrates a strong commitment to security, trust, and compliance for mission‑critical digital platforms.

Click here to log in d-Cert Subscriber Portal to register or submit d-Cert (Server) application.