For RF and other forms of electromagnetic energy, amplitude is indicative of the strength of the electric field of the waveform and thus the strength/intensity of the emitted signal. The greater the amplitude, the stronger the signal strength as the intensity of an electromagnetic wave is directly proportional to the square of the amplitude. Amplitude indicates to an attacker that a particular signal is strong when it reaches his or her antenna. This means the encoded higher-layer protocol (e.g., 802.11), which is embedded inside the signal, is easier to decode, meaning sniffing the air will be easier.
If the amplitude of the RF signal can be reduced by the administrator of the wireless device, then an attacker's WNIC would have a much harder time decoding the embedded protocol(s). Assuming the wireless hardware is configurable, the defender can do this by limiting the power output of the RF transmitter, e.g., reducing it from 30 mW to 1 mW.
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