Ask HN: How secure is my wireless iMac keyboard?
I work in a shared office space with hundreds of people in close proximity. How likely is it that others can read my key input?
If someone in your office cared about what you're typing, they'd simply spy on you visually, with either their eyes or a camera. Or install a keylogger, if it's their device.
Bluetooth , in the past, has been more secure for this methodology. Certain RF keyboards have been shown to be insecure, but that shouldn't make you feel as if it is entirely safe.