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A comment on World’s first quantum-cryptographic satellite network is likely to be Chinese. Parent comment
Here is a protocol that works (BB84):
Needed:
* A way for Alice to communicate (classically) with Bob that can be read by Eve, but CANNOT be manipulated by Eve.
* A way for Alice to send magic paper (qubits) to Bob, that CAN be intercepted and manpulated by Eve.
Steps:
1. Alice sends a bunch of magic paper to Bob.
1.5 Eve potentially intercepts the shipment and manipulates it.
2. For every piece of paper, Alice randomly decides which digit to check. Bob does the same independently.
3. Alice and Bob tell each other over the classic channel, that Eve cannot intercept, which digits they checked.
4. They discard the papers where they checked different digits, and use the rest to form a One Time Pad.
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Here is a protocol that works (BB84):
Needed:
* A way for Alice to communicate (classically) with Bob that can be read by Eve, but CANNOT be manipulated by Eve.
* A way for Alice to send magic paper (qubits) to Bob, that CAN be intercepted and manpulated by Eve.
Steps:
1. Alice sends a bunch of magic paper to Bob.
1.5 Eve potentially intercepts the shipment and manipulates it.
2. For every piece of paper, Alice randomly decides which digit to check. Bob does the same independently.
3. Alice and Bob tell each other over the classic channel, that Eve cannot intercept, which digits they checked.
4. They discard the papers where they checked different digits, and use the rest to form a One Time Pad.