Review the excerpt from The Code Book.If Eve parks a van outside Alice's house, she can use sensitive tempest equipment to identify each individual keystroke that Alice makes on her computer. This would allow Eve to intercept the message as it is typed into the computer, before it is encrypted. To defend against tempest attacks, companies are already supplying shielding material that can be used to line the walls of a room to prevent the escape of electromagnetic signals.
Answer
w
why computers are easily stolen.
w
why keyboards are unsanitary.
h
how computer security can be broken.
h
how friends share secret messages.
Explanation
The excerpt describes Eve using sensitive equipment to detect Alice’s keystrokes from outside her house, allowing Eve to read a message before encryption protects it. It also explains how shielding can prevent this kind of attack. So the passage is about how computer security can be broken, choice C.
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