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. In this excerpt, the author explains
Answer
A
how friends share secret messages.
B
how computer security can be broken.
C
why computers are easily stolen.
D
why keyboards are unsanitary.
Explanation
The excerpt describes Eve using electromagnetic signals from Alice’s keystrokes to read a message before encryption, then mentions shielding designed to stop that attack. It explains a way computer security can be broken, so the correct choice is “how computer security can be broken.”
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