What is the best way to tell a secret? Whisper it as quietly as possible. How quietly is that? Richard Hughes, 47, a researcher at the fabled Department of Energy lab in Los Alamos, N.M., and the preeminent researcher in the mind-bending field of quantum cryptography, speaks as softly as can be--in single photons of light. Combining cutting-edge encryption with the arcana of subatomic physics, Hughes designs coded messages that can be neither broken nor intercepted.
Here's the problem: codes only work if both parties, sender and receiver, have the key--and at some point they have to pass that key...
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