Do you use encryption protocols when transferring data? If yes, which ones?

Traffic to and from the DESelect servers is secured through SSL/TLS based connectivity. The DESelect service always requires SSL/TLS between the client (browser, mobile apps, ...) and the server. Also, all communication between DESelect and the Marketing Cloud Api happens over SSL.

Administrative functions towards DESelect servers in the data center are performed over encrypted channels. These include SSH and SSL/TLS.