How to ensure that wireless Logitech keyboard is encrypted?

Just as the title says, I'm using a wireless Logitech keyboard, and I want to ensure that my keystrokes are in fact encrypted. On Windows, I could do that very easily by using the Logitech SetPoint software, pressing a key sequence (Ctrl+Alt+F12), pressing the Connect button on the keyboard, and typing in an encryption key that's displayed on the monitor. Set and done!

How do I do the same on Ubuntu Linux?

Here is a screentorial on Windows:

There is a graphical tool called Solar. It can also show many details of logitech devices. If it shows you an unencrypted connection, you can (if your keyboard is supported) use it to pair them properly.

Please check first if your keyboard is supported. There is a list and instructions on the website. Generally, Solar supports all unifying reciever devices and some of the others.

https://pwr.github.io/Solaar/

Go through the pdf document , you will understand how a wireless keyboard works and what all security feature are built to the wireless devices to avoid eavesdropping.

http://www.blackhat.com/presentations/bh-dc-08/Moser/Whitepaper/bh-dc-08-moser-WP.pdf

And about the encryption software logitech setpoint , when checked there's no support provided by the logitech to my knowledge, but as a alternate you can use a HIDPoint (freeware).