“Some time ago, I needed to find a new wireless keyboard. With the level of digital paranoia that I have, I chose one with 128-bit AES air interface encryption. But is eavesdropping a justifiable concern? How insecure would it actually be to type your passwords using an older type of wireless keyboard?
To investigate this, I bought an old Logitech iTouch PS/2 cordless keyboard at an online auction. It’s dated July 2000. Back in those days, wireless desktops used the 27 MHz shortwave band; later they’ve largely moved to 2.4 GHz. This one happens to be of the shortwave type. They’ve been tapped before (pdf), but no proof-of-concept was published.” Read more here.