One of the author’s purposes in The Code Book is to explain different types of codebreaking to his readers. Which line best demonstrates this purpose?
Answer
A
A theoretical breakthrough would be a fundamentally new way of finding Alice's private key.
B
Mathematicians have been studying factoring for centuries, and modern factoring techniques are not significantly better than ancient techniques.
C
A more recent development is the so-called tempest attack , which aims to detect the electromagnetic signals emitted . . . in a computer's display unit.
D
If scientists could build a quantum computer, it would be able to perform calculations with . . . enormous speed.