==== Zertifikate ====
Zur Erstellung von .pem .key aus einer .pfx-Datei
  - To convert a PFX file to a PEM file that contains both the certificate and private key:<code>
openssl pkcs12 -in filename.pfx -out cert.pem -nodes</code>
  - To convert a PFX file to separate public and private key PEM files:
    * Extracts the private key form a PFX to a PEM file:<code>
openssl pkcs12 -in filename.pfx -nocerts -out key.pem</code>
    * Exports the certificate (includes the public key only):<code>
openssl pkcs12 -in filename.pfx -clcerts -nokeys -out cert.pem</code>
    * Removes the password (paraphrase) from the extracted private key (optional):<code>
openssl rsa -in key.pem -out server.key</code>