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a.sign SSL advanced

Encrypted communication


Enhance the integrity of your homepage while at the same time boosting your customer's trust with our a.sign SSL certificates:

If an SSL certificate has been issued for a domain, the page can be accessed via an encrypted connection. This ensures that data can be transferred between web server and client without falling prey to improper use. The identity of your server or your domain is confirmed by A-Trust and can be checked by your customers during communication.

The term of validity for these certificates is currently one year.



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a.sign SSL qualified

With a.sign SSL qualified, you obtain a server certificate of the highest security level: The encryption is carried out in a qualified and therefore eIDAS-compliant manner. The certificate period of validity is one year.



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  • SSL certificates are issued only to holders of Austrian or German web servers.
  • If the domain holder is an organisation, A-Trust verifies the data via an extract from the Austrian Company Register or the European Business Register (EBR). In addition, an official photo ID of the authorised representative is required.
  • If the requesting organisation is not a registered company, verification shall be provided by submission of a copy of a document stating that the organisation actually exists - a current extract (not older than three months) of a relevant official register or comparable documents. In addition, databases of trusted third parties may also be used for verification. If the authorised signatory of your organisation is not named in the Austrian Company Register or the EBR, you will be required to provide additional proof of signatory power.
  • Your authorisation to use the domain name indicated is verified in the databases of the registry organisations nic.at and DENIC. The key length must be at least 2048 Bit (RSA). SHA-256 is the exclusive hash algorithm accepted.
  • The certification request must necessarily contain the values C (nationality of the domain holder or country in which the organisation is headquartered) and CN (domain name). Optionally, the values O (organisation's name in accordance with Company Register) or OU and E can be provided.