Why is infrared generally considered to be more secure to eavesdropping than multidirectional radio transmissions?

The correct answer is C. Because infrared requires direct line-of-sight paths. Infrared (IR) communication requires a direct, unobstructed line-of-sight between transmitter and receiver. Because IR signals do not pass through walls or other solid obstacles, an eavesdropper must be physically positioned in the same direct path between the two communicating…

Submitted by renata2k· Apr 18, 2026Network and Communications Security

Question

Options

ABecause infrared eavesdropping requires more sophisticated equipment.
BBecause infrared operates only over short distances.
CBecause infrared requires direct line-of-sight paths.
DBecause infrared operates at extra-low frequencies (ELF).

How the community answered

(16 responses)

A
6% (1)
C
88% (14)
D
6% (1)

Explanation

Infrared (IR) communication requires a direct, unobstructed line-of-sight between transmitter and receiver. Because IR signals do not pass through walls or other solid obstacles, an eavesdropper must be physically positioned in the same direct path between the two communicating devices. This makes interception significantly harder compared to omnidirectional radio waves, which propagate in all directions and can penetrate walls, allowing interception from a distance or through barriers. Short range (option B) adds some protection, but the defining security property is the line-of-sight requirement.

Topics

#Wireless Security#Infrared Technology#Eavesdropping Prevention#Line-of-Sight

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