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American Institute of Physics



December-January 2004-2005 cover

If Eve intercepts the transmission
between Alice and Bob, photons are destroyed. Eve must generate a new quantum message to send to Bob, guessing at the digital values of many of the photons and inevitably introducing errors into the encryption key. If Alice and Bob compare their digital key values and find significant differences, they can discard the key.

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Cover illustration by Jac Depczyk


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