Unfortunately this is not possible, as Orange Squeeze does not support SSL (e.g. HTTPS). For historical reasons, the app uses a custom HTTP protocol implementation, and it’s not as simple as just flipping a switch and allowing HTTPS. At this time there are no plans to support HTTPS directly within the app.
You can do something similar to this by using VPN software on your device to connect to your network and then Orange Squeeze can connect securely without using SSL itself.