> In 1985, Wim van Eck published the first unclassified technical analysis of the security risks of emanations from computer monitors.[2][3] This paper caused some consternation in the security community, which had previously believed that such monitoring was a highly sophisticated attack available only to governments; van Eck successfully eavesdropped on a real system, at a range of hundreds of metres, using just $15 worth of equipment plus a television set.
In this context "emanations" means a signal allowing the listener to reconstruct the image and read the words on the screen.
I'm not sure if it works with modern monitors (CRTs were pretty high voltage!), but they are also quite "loud" in EMF. A fun experiment is to walk around your house with a portable radio in AM mode. You can "hear" all the electronics!
> In 1985, Wim van Eck published the first unclassified technical analysis of the security risks of emanations from computer monitors.[2][3] This paper caused some consternation in the security community, which had previously believed that such monitoring was a highly sophisticated attack available only to governments; van Eck successfully eavesdropped on a real system, at a range of hundreds of metres, using just $15 worth of equipment plus a television set.
https://en.wikipedia.org/wiki/Van_Eck_phreaking
In this context "emanations" means a signal allowing the listener to reconstruct the image and read the words on the screen.
I'm not sure if it works with modern monitors (CRTs were pretty high voltage!), but they are also quite "loud" in EMF. A fun experiment is to walk around your house with a portable radio in AM mode. You can "hear" all the electronics!