Why is infrared generally considered to be more secure to eavesdropping than multidirectional radio
transmissions?
A.
Because infrared eavesdropping requires more sophisticated equipment.
B.
Because infrared operates only over short distances.
C.
Because infrared requires direct line-of-sight paths.
D.
Because infrared operates at extra-low frequencies (ELF).
Explanation:
Infrared communications require line-of-sight transmission. This makes infrared relative secure from electronic
eavesdropping.
Incorrect Answers:
A: Infrared eavesdropping does not require more advanced transmissions.
B: Infrared operates over short distances, but this is not the main reason it is hard to eavesdrop. Compared to
multidirectional radio transmission a direct line of sight is necessary.
D: Infrared operates at high frequencies around 430 THz.