Question

review the excerpt from the code book. if eve parks a van outside alices 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 why computers are easily stolen. why keyboards are unsanitary. how computer security can be broken. how friends share secret messages.

Explanation:

The excerpt describes Eve using tempest equipment to intercept messages before encryption and companies' counter - measures against such attacks, which is about computer security being compromised.

Answer:

how computer security can be broken.