Wednesday, April 19, 2006

Indirect Tapping

A current in a conductor gives rise to a magnetic field around the conductor. When the current varies, the magnetic field changes. Conversely, if a conductor is immersed in a magnetic field, changes in the magnetic field will induce currents in the conductor. A coil of wire attached to a telephone or clamped to a telephone line can pick up conversations on the telephone. This type of wiretap, where there is no physical connection between the tap and the target line, is called Indirect Tapping.


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