Office Pro Plus licensing - encryption of the connection between Microsoft server and client PC

Does someone know the encryption level of the connection between the Microsoft licensing server and the client PC?

 

The server needs in a first step some personal information and in the second and next steps the security token of the client PC.nFor the connection and the transmission between the client PC with Office Pro Plus and the Microsoft server we need a encryption.

 

In the documentations are not any information about the encryption of this connection.

https://support.office.com/de-de/article/Von-Office-365-ProPlus-an-Office-365-gesendete-Lizenzierungs-und-Aktivierungsdaten-f7d07a88-35c3-48f5-b30e-c842f2d911a5?ui=de-DE&rs=de-DE&ad=DE