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Spectre

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“The light is on in their window. They must be home.” This is a classic example of a side information channel. They didn’t TELL you they were home. But the side effect of them being home in the evening is the light in the window — which is how you’re pretty sure they are home even though this information wasn’t communicated to you. Creative Commons CC0 1.0 Another example that is a bit closer to cryptography concerns why…