Read the excerpt from The Code Book.Despite the enormous strength of RSA and other modern ciphers, cryptanalysts are still able to play a valuable role in intelligence gathering. Their success is demonstrated by the fact that cryptanalysts are in greater demand than ever before—the NSA is still the world's largest employer of mathematicians.
Answer
M
Many math experts work for the National Security Agency.
T
The RSA computer system makes our country more secure.
S
Skilled people are still important national security workers.
C
Computers are better than people at keeping the nation safe.
Explanation
The excerpt says cryptanalysts still contribute to intelligence gathering, even though modern ciphers such as RSA are extremely strong. Their continued high demand—and the fact that the NSA employs many mathematicians—shows that skilled people remain important to national security. Choice C best expresses that main idea; choice A is a detail supporting it.
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