Security and privacy
Certificate file
In short and in plain language
A certificate file is a file for signing in.
Together with a password, it works like a key.
Some portals let you download the file when you register. You store it yourself.
A copy in another place is a good idea.
Definition
A certificate file is a file that, together with a password, serves as the key for signing in. With Mein ELSTER, you download it during registration and store it yourself. A backup copy in another place is a good idea.