O Defending Against RF Spectrum Analysis

From a technical perspective, it is extremely difficult to prevent RF spectrum analysis from occurring simply because it is a passive exercise. The attacker is not sending out any RF energy packets bearing higher-layer protocol information. He or she is only passively receiving all RF energy packets within the spectrum analyzer's frequency range.

However, you can potentially identify if an attacker is performing spectrum analysis in the immediate area through simple observation. A spectrum analyzer would be either a handheld device or an external dongle (e.g., WiSpy) or an add-on device that attaches to a laptop. To make more effective use of the spectrum analyzer, the attacker is also likely to walk around taking sampling readings. Thus, physical observation with the human eyeball is the best defense against an attacker roaming through any given location taking RF readings.

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