How to find hidden cameras Franken（如何找到隐藏的摄像机弗兰肯）.pdf

How to find hidden cameras Marc Roessler marc@tentacle.franken.de March 25, 2002 “We shall meet in the place where there is no darkness” – 1984, George Orwell Abstract While it was easy to spot cameras twenty years ago due to their large size, this has become increasingly difficult during the last decade. Cameras have become much smaller and consume a fraction of the power they did ten years ago. Due to this, covert installation in nearly any imaginable place is possible. This paper will show methods frequently used for hiding cameras as well as methods to detect and locate covertly installed cameras. Document available at http://www.franken.de/users/tentacle/papers/ 1 Introduction During the last few years the number of surveillance cameras has grown out of bounds. Cameras have been installed in many public and semi-public places such as universities [1], streets, supermarkets, gas stations, parking garages, cinemas, bars, shops, busses, train stations and even discos. About 25 million CCTV1 cameras are estimated to be in operation worldwide at the time of writing [2]. Some countries, notably Great Britain, are trying to fully cover every corner of public life with cameras. The Privacy International CCTV page [3] states that between 225 and 450 Million Dollars are spent on surveillance technology in Britain per year, involving an estimated 300.000 cameras. These efforts result in a person driving through the city of London being filmed at least once every five minutes [4]. In the near future cameras may even be installed in all taxis, keeping an eye on the passengers [5]. In Houston, Texas, about 400 cabs have been equipped with such c