Embodiments include apparatuses, methods, and systems including a wireless display system with a secure back channel to transmit an input from an input device coupled to a display receiver device to a display transmitter device. An input from an input device may be captured by a display receiver device in a secure execution environment. Furthermore, the captured input may be transmitted through a back channel to a display transmitter device in a secured form based on one or more secure parameters negotiated with the display transmitter device. The display transmitter device may receive the input in the secured form, decrypt the input in the secured form based on the one or more secure parameters to obtain the input, and further supply the input to an operating system or an application to operate on the display transmitter device. Other embodiments may also be described and claimed.