Reference: see the CERTIFICATES interface here.

The CERTIFICATES module allows users to IMPORT and EXPORT contacts (via their certificates), respectively, TO and FROM OBAKE. 

Every time you want to share information with people (authorize them to get access to it), you need to choose THEIR certificates. At the same time, if someone needs to send data to you, it will be necessary to add YOUR certificate to the list of authorized persons.

Because of these situations, you must know how to send your certificate to all (EXPORT) and how to receive and get their certificates (IMPORT). In the following chapters, you will learn how to perform these (straightforward) steps, but if you prefer to see a video, please click in this link.