Editing Cathode-ray tube (section)

==Security concerns==
Under some circumstances, the signal radiated from the [[electron gun]]s, scanning circuitry, and associated wiring of a CRT can be captured remotely and used to reconstruct what is shown on the CRT using a process called [[Van Eck phreaking]].<ref>{{cite journal |last1=van Eck |first1=Wim |title=Electromagnetic radiation from video display units: An eavesdropping risk? |journal=Computers & Security |date=1 December 1985 |volume=4 |issue=4 |pages=269–286 |doi=10.1016/0167-4048(85)90046-X |citeseerx=10.1.1.35.1695 }}</ref> Special [[Tempest (codename)|TEMPEST]] shielding can mitigate this effect. Such radiation of a potentially exploitable signal, however, occurs also with other display technologies<ref name=Kuhn2004>{{cite book |last1=Kuhn |first1=Markus G. |chapter=Electromagnetic Eavesdropping Risks of Flat-Panel Displays |title=Privacy Enhancing Technologies |pages=88–107 |doi=10.1007/11423409_7 |chapter-url=https://books.google.com/books?id=Sd3zBwAAQBAJ&pg=PA88 |series=Lecture Notes in Computer Science |year=2005 |volume=3424 |publisher=Springer |location=Berlin, Heidelberg |isbn=978-3-540-26203-9 |citeseerx=10.1.1.9.7419 }}</ref> and with electronics in general.{{Citation needed|date=September 2010}}