Hi Manuelito,
Technically the web interface worked perfectly, but in the end there were too many security-related problems (e.g. storing access tokens for the cloud providers on our servers, etc.). Instead we have decided to provide a plugin (in beta) for Google Chrome which can be used to access encrypted files via the browser - although this might not work in an internet cafe.
You can find more information about it here:
https://chrome.google.com/webstore/detail/boxcryptor/ijmndaodmdjamfepoijpolhjddgfgmme?hl=de
Best regards,
Robert