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?

The line about the “tempest attack” names a specific codebreaking method and briefly describes how it works: it detects electromagnetic signals from a computer’s display. That directly shows the author explaining different types of codebreaking. The other choices focus on a theoretical breakthrough, the history of factoring, or what a quantum computer could do.

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