TEMPEST Questions...

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I'm writing an article on TEMPEST technology.

The focus is on what TEMPEST is and how to defeat it, if possible.  So far
I've gotten some insightful information, but I'm looking for all I can get.

Has anyone ever heard of TEMPEST being used in the continental US?  Can anyone
tell me what measures offer some level of protection, or steps that can be
taken to reduce the likelihood of being successfully targeted?  Has anyone
ever seen TEMPEST in action?

Any and all information will be greatly appreciated.

I prefer responses via e-mail to dzeanah@holonet, but I also read this
newsgroup pretty frequently.

Thanks a lot.

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... I don't see my signature anywhere on this "social contract"
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| Fidonet:  Derek Zeanah 1:102/903
| Internet: Derek.Zeanah@f903.n102.z1.fidonet.org
| via Borderline! uucp<->Fido{ftn}gate Project +1-818-893-1899

On 6 Jan 1995, Derek Zeanah wrote:

> 
> I'm writing an article on TEMPEST technology.
> 
> The focus is on what TEMPEST is and how to defeat it, if possible.  So far
> I've gotten some insightful information, but I'm looking for all I can get.
> 
> Has anyone ever heard of TEMPEST being used in the continental US?  Can anyone
> tell me what measures offer some level of protection, or steps that can be
> taken to reduce the likelihood of being successfully targeted?  Has anyone
> ever seen TEMPEST in action?
> 
You might start with van Eck, Wim, "Electromagnetic Radiation from Video 
Display Units:  An Eavesdropping Risk?", Computers & Security 4 (1985) 
269-286.  That will give you the technical basics.

If someone has actually seen Tempest interception in action, I'd like to 
hear about that as well.

John A. Thomas		jathomas@netcom.com
N5RZP			214/263-4351

Hi all,

Regarding Tempest, 

Something similar happens to me in my workshop. I have several computers
stacked on two shelves. It is quite commen for several of them to be on
at one time. In particular when I have my Amiga 1200 driving my NEC TV/Monitor
I notice that it appears on the other composite video monitors even though
the Amiga drives RGB. What I think is happening is that the NEC is converting
the RGB to standard TV drive rates. The short of it is that I can watch my
Amiga 1200 on my TV that is sitting a couple approx 3ft. from it.

It could also be the fact that the 1200 has a video output that is poorly 
shielded. It is capable of driving a composite device directly as well.

One aspect that is interesting is that if you have several sources going 
at once the quality degrades. One possible technique for defeating such
monitoring would be to have a couple of standard video recorders drive a
video game rf modulator tied to an antenna to provide a 'shell' of drivel
from your cable feed. Your VCR may be able to drive the antenna directly.

Take care.