If you are truly concerned with this you should read up on TEMPEST, (ie: high corporate security or gov., mil. considerations) You should definitely not use a radio keyboard and you would concern yourself more with the electromagnetic radiation that your PC, monitor, keyboard, printer etc produce as a whole. This electromagnetic radiation can be picked up from a 1/4 mile away and reconstructed and read. And that was equipment I saw of 15 years ago. Actual keystrokes and screen outputs can be reproduced on the monitoring equipment with this type of eavesdropping. All the cables on your computer act like an antenna amplifying the signal and when you hook up a phone like to it this is increased substantially. The shielding specs for computers are known as TEMPEST levels. There have been several recent press articles on corporate espionage using this method where the data was collected using TEMPEST means.You can buy computers with TEMPEST ratings and you can find limited info on what it is on the web. Any RS232 cable can be eavesdropped as well ie: serial muxed connections over several miles, just by radiation. Encryption would do no good in this instance.....So secure is somewhat of a relative term...

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