Quantum Key Distribution and String Oblivious Transfer in Noisy Channels

Details Quantum Key Distribution and String Oblivious Transfer in Noisy Channels Quantum Key Distribution and String Oblivious Transfer in Noisy Channels

1996-06-04

arxiv.org/abs/quant-ph/9606003v1

Physics

Quantum Physics

15 pages, no figure, to be published at Crypto 96

Scientific paper

We prove the unconditional security of a quantum key distribution (QKD) protocol on a noisy channel against the most general attack allowed by quantum physics. We use the fact that in a previous paper we have reduced the proof of the unconditionally security of this QKD protocol to a proof that a corresponding Quantum String Oblivious Transfer (String-QOT) protocol would be unconditionally secure against Bob if implemented on top of an unconditionally secure bit commitment scheme. We prove a lemma that extends a security proof given by Yao for a (one bit) QOT protocol to this String-QOT protocol. This result and the reduction mentioned above implies the unconditional security of our QKD protocol despite our previous proof that unconditionally secure bit commitment schemes are impossible.

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