Fwd: [TSCM-L] Re: New paint blocks out cell phone signals
---------- Forwarded message ---------- From: coderman <coderman@gmail.com> Date: Mar 4, 2006 12:30 AM Subject: Re: [TSCM-L] Re: New paint blocks out cell phone signals To: TSCM-L2006@googlegroups.com On 3/3/06, dan@geer.org <dan@geer.org> wrote:
... why can't I paint my own home with this stuff? We can certainly cast this in property-rights terms I should think.
you can: http://www.lessemf.com/paint.html there are also a few companies selling faraday cloth, though i don't recall the attenuation provided. what i'd really like is something toggle'able, although the product described in this thread sounds more like snake oil than truly "nano reconfigurable faraday surface" a friend also has an attic/loft well coated in many layers of lead base; there are two small windows and the attenuation with lead based appears to be pretty decent as well. (a little hard to find these day, though :)
On Sat, Mar 04, 2006 at 12:31:01AM -0800, coderman wrote:
you can: http://www.lessemf.com/paint.html
More background on: http://cryptome.org/datasec.htm
there are also a few companies selling faraday cloth, though i don't recall the attenuation provided. what i'd really like is something toggle'able, although the product described in this thread sounds more like snake oil than truly "nano reconfigurable faraday surface"
a friend also has an attic/loft well coated in many layers of lead base; there are two small windows and the attenuation with lead based appears to be pretty decent as well. (a little hard to find these day, though :)
Lead is only useful for radiation shielding, ungrounded lead with unshielded windows and power wiring with no frequency filters leading outside is a not particularly good Faraday cage. Lead base paint doesn't even contain metallic lead, but lead oxides in a small proportion. If you have to also shield against magnetic fields, then http://en.wikipedia.org/wiki/Mu-metal & Co are your friends. -- Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org ______________________________________________________________ ICBM: 48.07100, 11.36820 http://www.ativel.com 8B29F6BE: 099D 78BA 2FD3 B014 B08A 7779 75B0 2443 8B29 F6BE [demime 1.01d removed an attachment of type application/pgp-signature which had a name of signature.asc]
On 3/4/06, Eugen Leitl <eugen@leitl.org> wrote:
... Lead is only useful for radiation shielding, ungrounded lead with unshielded windows and power wiring with no frequency filters leading outside is a not particularly good Faraday cage.
agreed, and thanks for the clarification. it was effective enough kill to wifi in 2.4Ghz, but this is a far cry from TEMPEST...
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Eugen Leitl