The Code Book: The Science of Secrecy from Ancient Egypt to Quantum Cryptography

by Simon Singh

NSA is still the world’s largest employer of mathematicians.

“Anyone who can contemplate quantum mechanics without getting dizzy hasn’t understood it.”

Only quantum theory allows physicists to calculate the consequences of nuclear reactions in power stations; only quantum theory can explain the wonders of DNA; only quantum theory explains how the sun shines; only quantum theory can be used to design the laser that reads the CDs in your stereo. Thus, like it or not, we live in a quantum world.