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A comment on An Implementation of Tempest in GNU Radio. Parent comment

Re:An Implementation of Tempest in GNU Radio by ardy42 on Wednesday May 13, 2020 @04:19PM (#23171356)
>> TEMPEST [1] (or Van Eck Phreaking) is a technique to eavesdrop video monitors by receiving the electromagnetic signal emitted by the VGA/HDMI cable and connectors

IIRC, I think it originally used the analog signals generated by controlling the electron gun in a CRT.

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Re:An Implementation of Tempest in GNU Radio by JackRabbitSlim on Wednesday May 13, 2020 @07:58PM (#23173357)
Yes, but no.

https://www.cl.cam.ac.uk/~mgk25/pet2004-fpd.pdf

tl;dr The signal from a DVI cable can be detected but at much more reduced ranges. See also; RAGEMASTER (Snowden leak) a range extending implant for video cables.

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