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CISSP® All-in-One Exam Guide by Shon Harris

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Quantum cryptography can be carried out using various methods. So, we will walk through one version to give you an idea of how all this works.

Let’s say Tom and Kathy are spies and need to send their data back and forth with the assurance it won’t be captured. To do so, they need to establish a symmetric encryption key on both ends, one for Tom and one for Kathy.

In quantum cryptography, photon polarization is commonly used to represent bits (1 or 0). Polarization is the orientation of electromagnetic waves, which is what photons are. Photons are the particles that make up light. The electromagnetic waves have an orientation of horizontal or vertical, or left hand or right hand. Think of a photon as a jellybean. As a jellybean flies through the ...

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