User certificate withdrawal

In case you lost your private key (lost notebook, hacked computer...) somebody else may use your identity. Therefore, you should immediately withdraw your certificate. This is also reasonable if you changed your name or email. Please apply for a withdrawal


The queried serial number of your certifcate can be found in each signed email you sent. The requested PIN is the one you set with the certificate application. It prevents an unauthorized withdrawal of your certificate. In case you cannot manage to withdraw the certificate on your own, do not hesitate to contact



Certification authority

Albert-Einstein-Str. 22
18059 Rostock

Martin Sievers-Luboschik
Tel: +49 381 498-5328

Jörg Maletzky
Tel: +49 381 498-5339

Jörg Zerbe
Tel: +49 381 498-5320