CVE-2010-1184
The Microsoft wireless keyboard uses XOR encryption with a key derived from the MAC address, which makes it easier for remote attackers to obtain keystroke information and inject arbitrary commands via a nearby wireless device, as demonstrated by Keykeriki 2.
Date published : 2010-03-29
http://www.remote-exploit.org/?p=437
http://www.theregister.co.uk/2010/03/26/open_source_wireless_sniffer/