Security Basics mailing list archives
RE: Seeking a solution for detecting hidden cameras
From: "Steven Hess" <shess () myrapidsys com>
Date: Tue, 13 Mar 2007 11:51:41 -0400
Hello: Some additional information. The wire mesh, if grounded, will attenuate wireless RF signals, depending on the frequency and the size of the "holes" in the mesh. Google "Faraday Cage" for more information. If you want to see a good example - the window on a microwave oven allows light to pass, but blocks the 2140 MHz used by the oven. Note that the coverage is a bit better than a screen, though. The frequency of a microwave oven is close to the 2.4 GHz used by 802.11b/g but is not the same as the 5 gig used by 802.11a Higher frequencies need smaller holes = better attenuation. Detectors of tube type cameras used the fact that the magnetic deflection coils used in scanning the image, were running at a multiple of the horizontal scanning rate. This produces a detectable EMF signal. CCD pickups use much less power, and dump row data at a different frequencies depending on the size and megapixel of the pickup, and are very hard to detect by spurious emissions. In my opinion, the best way to prevent this kind of intrusion, is to build a zone around the dressing room, where inspection of surfaces is possible. Alarm this area. Checking for wires and cameras on the inside walls is then a management responsibility. The wire mesh is a possibility, and could be retrofitted, but is not the complete answer. Steven Hess CPBE WFTT-TV -----Original Message----- From: listbounce () securityfocus com [mailto:listbounce () securityfocus com] On Behalf Of Pranav Lal Sent: Monday, March 12, 2007 8:56 PM To: security-basics () securityfocus com Subject: RE: Seeking a solution for detecting hidden cameras Could such a mesh be installed in an already constructed structure like a shopping maul? -----Original Message----- From: Mondragon, Todd [mailto:todd.mondragon () fmr com] Sent: Monday, March 12, 2007 9:30 PM To: Murda Mcloud; Pranav Lal; security-basics () securityfocus com Subject: RE: Seeking a solution for detecting hidden cameras No need to jam, a wire mesh placed in the walls and grounded will stop most RF devices cold. The mesh should be of the same type as screen door mesh (must be wire though!) to be able to stop any 2ghz signals. The mesh would also need to be electrically contiguous of course. Might make it hard to drill as well, the mesh would foul any powered bits and a hand tool would have great difficulty dealing with it as well. Todd Mondragon -----Original Message----- From: listbounce () securityfocus com [mailto:listbounce () securityfocus com] On Behalf Of Murda Mcloud Sent: Sunday, March 11, 2007 7:53 PM To: 'Pranav Lal'; security-basics () securityfocus com Subject: RE: Seeking a solution for detecting hidden cameras One thing to do would be to build the room as clean and free from places that cameras could be hidden etc. ie no benches etc. Make it so that any tampering would be obvious. Also, make the walls etc out of something that would be hard to drill a pinhole in. Then some of those detectors that you listed could be used-though I can't vouch for any of them. Maybe there's a way of jamming signals too? -----Original Message----- From: listbounce () securityfocus com [mailto:listbounce () securityfocus com] On Behalf Of Pranav Lal Sent: Friday, March 09, 2007 6:08 PM To: security-basics () securityfocus com Subject: Seeking a solution for detecting hidden cameras Hi all, I have been asked by a client to find a solution for detecting cameras in dressing rooms etc. The client has trial rooms where customers can try various garments. The concern is that some one could plant a camera in one of these rooms and photograph customers. I have checked online and have found the following sources; http://www.brickhousesecurity.com/sf-103.html http://www.spytechs.com/bug_sweep_equip/vcd_43.htm http://www.pimall.com/nais/countervideo.html http://www.intpro.co.uk/pinhole.htm http://www.intpro.co.uk/camera%20detector.htm Are there any others? Has any one on this list tried any such solutions? I have found an interesting reference on hiding and detecting cameras at http://www.tentacle.franken.de/papers/hiddencams.pdf Pranav
Current thread:
- RE: Seeking a solution for detecting hidden cameras, (continued)
- RE: Seeking a solution for detecting hidden cameras Murda Mcloud (Mar 12)
- RE: Seeking a solution for detecting hidden cameras Pranav Lal (Mar 13)
- RE: Seeking a solution for detecting hidden cameras Rosario Chella (R) (Mar 13)
- RE: Seeking a solution for detecting hidden cameras Mondragon, Todd (Mar 13)
- RE: Seeking a solution for detecting hidden cameras Murda Mcloud (Mar 13)
- RE: Seeking a solution for detecting hidden cameras Liam Downward (Mar 13)
- Re: Seeking a solution for detecting hidden cameras Yan Zhai (Mar 13)
- Re: Seeking a solution for detecting hidden cameras Buz Dale (Mar 13)
- RE: Seeking a solution for detecting hidden cameras Steve Armstrong (Mar 14)
- RE: Seeking a solution for detecting hidden cameras Murda Mcloud (Mar 13)
- RE: Seeking a solution for detecting hidden cameras Pranav Lal (Mar 13)
- RE: Seeking a solution for detecting hidden cameras Steven Hess (Mar 13)
- RE: Seeking a solution for detecting hidden cameras S. Earl Jarosh (Mar 14)
- RE: Seeking a solution for detecting hidden cameras Pranav Lal (Mar 15)
- RE: Seeking a solution for detecting hidden cameras Murda Mcloud (Mar 12)
- RE: Seeking a solution for detecting hidden cameras Steven Adair (Mar 13)
- RE: Seeking a solution for detecting hidden cameras Pranav Lal (Mar 14)