[funsec] keyboard ownage

Bryan Bradsby Bryan.Bradsby at capnet.state.tx.us
Wed Oct 22 09:23:46 CDT 2008

> As far as I know, historically TEMPEST (or the preceding research) was originally 
> concerned with keyboards, rather than screens


In 1982 while working for Datapoint corp, we built TEMPEST rated
computers. The keyboard, CPU and monitor were all shielded.

A full bird colonel told me that he had seen a demonstration of a system
that pointed an antenna at a computer across the lab. Everything on the
remote screen was (mostly) reproduced by decoding the RF emanations from
the distant monitor itself.

Think about it. The horizontal and vertical sweep frequencies will be
prominent in a spectrum analyzer. All you need then is the pulses from
the electron gun.

Bryan Bradsby

Texas State Government Network

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