hyderabad radiation from computers could be used as a surveillance system to steal valuable corporate dataelectromagnetic em emission from pcs travel great distances and can be intercepted reconstructed and viewed by adversaries says nuclear physician dr v h swaroopeverything you do on your computer can be intercepted from almost a distance of 1 km em emissions can pass even through walls and furniture there are systems that can tap this radiation from a distance and reconstruct the data he told the times of indiathe technology is believed to have been devised by intelligence agencies of the erstwhile soviet union named transient electromagnetic pulse standard tempest the technology was conceived by wim van eck a dutch scientist in 1985van eck proposed that cathode ray tubes in computers emit em radiation which are similar to radio waves and can be reconstructed from a remote location van ecks work was later substantiated by prof erhand moller of aachen university germany in a paper he submitted in 1990there is little awareness about these findings but governments across the globe are concerned about such spying they want to keep it a secret said antony george managing director of a city firm which sells protective shields against em radiationscientists in belarus a central asia republic developed a vacuum tube shield that absorbs harmful radiation from the crts we have sold these tubes to several defence institutions including drdo george saidinstitutions which use computers are now purchasing the protective shields we now want to concentrate on the corporate sector the home computer segment too has a good potential he added