HOTLINE

0900 940 910 (€ 1,09/min)
Monday through Friday (working days)
from 8:00 am to 6:00 pm

FAQs

You can find frequently asked questions here

Revocation service

Unfortunately, it is not possible to provide technical support at this number, because part of the revocation hotline is operated by an external call centre.

Revocation service for user certificates
(e.g. a.sign premium)
Rund um die Uhr - 365 Tage im Jahr
Revocation service for 
Handy-Signatur

Rund um die Uhr - 365 Tage im Jahr
Revocation service for 
Server certificates
Mo - Fr: 10 - 18 Uhr
Revocation service for developer certificates Mo - Fr: 10 - 18 Uhr

Card test

e-Card activation

A-Trust directory service

Verify quickly, simply and securely whether certificates by A-Trust have been issued to persons, an e-mail address or a server. 

Directory service