Citrix Receiver connects with XenApp and XenDesktop, where you can use the TLS 1.2 or lower protocol. There is also the option to use the SecureICA protocol to connect if you use the old XenApp versions.
As an UWP application, the application can run on devices such as Windows Phone, HoloLens, Surface Hub and support Continuum for mobile devices. It also supports touch, zoom, drag and drop operations.