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Old 10-02-2009, 09:44 PM   #1
Potemkin
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Default Anti-wi-fi paint offers security

http://news.bbc.co.uk/2/hi/technology/8279549.stm

Anti-wi-fi paint offers security

DIGITAL PLANET
By Dave Lee
BBC World Service

Man painting a wall
With a quick lick of paint, your wi-fi connection could be secured

Researchers say they have created a special kind of paint which can block out wireless signals.

It means security-conscious wireless users could block their neighbours from being able to access their home network - without having to set up encryption.

The paint contains an aluminium-iron oxide which resonates at the same frequency as wi-fi - or other radio waves - meaning the airborne data is absorbed and blocked.

By coating an entire room, signals can't get in and, crucially, can't get out.

Developed at the University of Tokyo, the paint could cost as little as £10 per kilogram, researchers say.

Cost-effective security

The makers say that for businesses it's a quick and cheap way of preventing access to sensitive data from unauthorised users. Presently, most companies have to invest in complicated encryption software to deter hackers.

Speaking on the BBC World Service's Digital Planet programme, Shin-ichi Ohkoshi, who is leading the project, explained how the paint could have many uses beyond security.

"In a medical setting, you could transmit large volumes of data from a medical device, such as an endoscope, to a computer.


You could block phone signals from outside and stop people's phones ringing during the movie.
Shin-ichi Ohkoshi, University of Tokyo

"By painting a solution containing our magnetic particles on the walls, you would quickly, and effectively, shield the room from stray electromagnetic radiation from outside."

While paints blocking lower frequencies have been available for some time, Mr Ohkoshi's technology is the first to absorb frequencies transmitting at 100GHz (gigahertz). Signals carrying a larger amount of data - such as wireless internet - travel at a higher frequency than, for example, FM radio.

"I'm working on a material that can absorb a larger range of frequencies. We are capable of making a paint that can absorb over 200 gigahertz."

He hopes that soon the technology could be woven into clothing.

"We're not sure about the true effects of electromagnetic waves, in this range, on the human body.

"We're assuming that excessive exposure could be bad for us. Therefore we're trying to make protective clothes for young children or pregnant women to help protect their bodies from such waves."

At the movies

The paint could also provide some much-needed relief during nights out at the cinema.

"Our current mobile phones work at much lower frequencies, around 1.5 gigahertz. But, our material can also absorb frequencies that low, so you could block phone signals from outside and stop people's phones ringing during the movie," he said.

As well as helping to keep the cinema quiet, the paint may also pave the way for higher quality screens.

"Movie pictures are beamed on the screen by the projector at the back of the cinema. But in the future, you could use a data link that works with millimetre waves.

"You would have problems with interference, unless you painted the wall and ceiling of the theatre with an absorbent material like ours.

"In fact, we've had an order from an American company keen to use our ink in its movie theatre - we've just sent them a sample."

'Nothing new'

Some security experts remain unconvinced by the paint.

"The use of electromagnetic shielding techniques are nothing new," said Mark Jackson, security engineer at Cisco UK. "They have been utilised by highly sensitive environments for many years."

Mr Jackson notes that while the paint may block eavesdroppers, it would not prevent other types of hackers or intruders.

"Paint that blocks RF based Wi-Fi transmissions does not in any way remove the need to ensure a robust security model is deployed," he added.

"Surely the thought of having to redecorate a building in order to provide Wi-Fi security is more costly & complex than security functionality available in even the cheapest of Wi-Fi access points?" he said.
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Old 12-23-2011, 01:53 PM   #2
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This is really interesting, but I couldn't find anyplace that sold it.

Where are they selling this, if they are at all?
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Old 12-23-2011, 02:53 PM   #3
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Quote:
Originally Posted by henry989144 View Post
This is really interesting, but I couldn't find anyplace that sold it.

Where are they selling this, if they are at all?
Amazon
Product Description
High Frequency Indoor Shielding Paint
Easy to apply water-based paint for walls, ceilings, doors and other interior surfaces. Very effective for blocking cell phone signals, CB, TV, AM, FM signals, radiofrequency radiation and microwaves. Tested highly effective up to 18 GHz!

Guarantee absolutely free of toxic solvents and additives and completely carbon-based to avoid corrosion or oxidizing metal particles over time.

Easy to handle - brush, roll, or spray similar to ordinary wall paint - and still achieve an amazing reduction of 99,99% of HF-Radiation with only one layer. Dries quickly. Water clean-up.

Due to its holohedral carbon structure, without fibers or meshes, it offers consistent attenuation regardless of the direction of signal polarization, and a highly conductive surface. As a bonus, carbon is a good RF absorber. About 10% of Y-Shield shielding effectiveness is due to absorption. This helps reduce reflections and minimizes the risk from RF sources trapped inside the shielded area.

Supplied as a frost resistant liquid. Long shelf life. Safe for air or ground shipping any time of year.

? Cover with latex paint, wallpaper, etc. to achieve desired aesthetics
? Color: black; RoHS Compliant
? Attenuation: typical 40 dB per layer; ~10 Ohm per sq
? Minimum application temperature: +1°C / 33.8°F
? Typical coverage: 50-100 ft² (~ 5-10 m²) per liter
? Shelf Life: 15 months, unopened
? Good water/humidity resistance
Requires grounding like any other RF shielding material. Interior or exterior application. Appropriate for home, industry, research, and educational applications. Can be overcoated with high hiding latex paint of any color.
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Old 12-23-2011, 03:23 PM   #4
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WHy not just build a faraday cage around your house???
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Old 12-23-2011, 06:28 PM   #5
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Quote:
Originally Posted by Auburn Boy View Post
WHy not just build a faraday cage around your house???
Easier and looks better.
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Old 12-28-2011, 01:49 AM   #6
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Arrow

Quote:
Originally Posted by Auburn Boy View Post
WHy not just build a faraday cage around your house???
That is precisely what the grounded coat of conductive paint is -- a Faraday cage.
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* The only usable tools for these tasks are guns, and thus I have the right to shoot anyone who would take my guns from me.
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