In computing, a certificate is used to achieve an electronic authentication by means of a digital signature. They were created by the certification department by means of a private key. There are quite a few kinds of certificate: the IT-baseline certificate (it demonstrates that all security measures had been taken for a respective information network); ISO-certificates issued by the Federal Office for Information Security; IT-security certificates that are created on an international basis and which are used for the evaluation of a product or a system.