The enthusiast community engaged in the use of Software Defined Radio (SDR) projects is ever finding new functionality with which to experiment. One recent example, particularly relevant to the TSCMi, is development of software capable of utilising SDR to mount a TEMPEST attack upon laptop screens.
TEMPEST attack capabilities have been around for a long time, but such an attack as this has previously required sophisticated and expensive hardware and associated complex software.
SDR is the use of a computer to move much of the functionality, previously provided within the expensive hardware of a radio transmitter or receiver, to be carried out by applications within the computer itself. All that is required to construct a highly sophisticated radio device is the addition of relatively inexpensive front-end USB radio peripheral. Examples can range from a simple TV dongle (about £15) to a more complex USRP (Universal Software Radio Peripheral) (£250 to £1000). A typical and capable device would be such as the HackRF Half duplex Transmitter/Receiver (see illustration). Link this to the wide range of open source software and you have your TEMPEST capability.
For more details about how this SDR community is progressing, and to gauge the breadth of interest in this project, details and related URLs may be found at https://www.rtl-sdr.com/tempestsdr-a-sdr-tool-for-eavesdropping-on-computer-screens-via-unintentionally-radiated-rf/