A secret key shared through quantum key distribution between two cooperativeplayers is secure against any eavesdropping attack allowed by the laws ofphysics. Yet, such a key can be established only when the quantum channel errorrate due to eavesdropping or imperfect apparatus is low. Here, I report apractical quantum key distribution scheme making use of an adaptive privacyamplification procedure with two-way classical communication. Then, I provethat the scheme generates a secret key whenever the bit error rate of thequantum channel is less than $0.5-0.1\sqrt{5} \approx 27.6%$, thereby making itthe most error resistant scheme known to date.
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