The unique and random physical-layer properties of optical fiber channels have been exploited for a simple and cost-effective secure key generation and distribution (SKGD). However, state-of-the-art SKGD approaches focused mainly on initial key extraction, while the post-processing protocol has to be explored to guarantee error-free operation, effective key generation rate (KGR) and high key secrecy. Here we propose a full post-processing protocol for SKGD in fiber networks. A lossy quantizer is optimized to achieve the trade-off between the KGR and key disagreement rate. The distributed source coding based information reconciliation is used to remove quantization errors. The privacy amplification is applied to improve the randomness and secrecy of the generated key using hashing functions. The post-processing protocol provides a SKGD solution of error-free, high randomness and high secrecy in fiber networks.

中文翻译：

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光纤网络中物理层密钥生成和分发的后处理协议

光纤通道独特且随机的物理层特性已被用于简单且经济高效的安全密钥生成和分发 (SKGD)。然而，最先进的 SKGD 方法主要侧重于初始密钥提取，而必须探索后处理协议以保证无错误操作、有效密钥生成率 (KGR) 和高密钥保密性。在这里，我们为光纤网络中的 SKGD 提出了一个完整的后处理协议。优化有损量化器以实现 KGR 和密钥不一致率之间的权衡。基于分布式源编码的信息协调用于去除量化误差。隐私放大用于使用散列函数提高生成密钥的随机性和保密性。