Wireless communication is easily eavesdropped due to the broadcast nature of the wireless medium. This has spurred extensive research into secret key establishment using physical layer characteristics of wireless channels. In all these schemes, the secret keys directly originate from the physical features of the real wireless channel, which is highly dependent on the communication environment nearby. Also, previous schemes require performing information reconciliation, which increases both the costs and the risk of key leakage. In this paper, we exhibit a novel wireless key establishment method allowing the transmitter to specify arbitrary content as the key and cause the receiver to obtain the same key leveraging a channel manipulation technique. We furthermore enable the transmitter to apply error-correction code to the key, so that the receiver can automatically correct any mismatched bits without sending key-related information back to the transmitter over the public channel. Experimental results demonstrate that our key establishment method reaches a success rate as high as 91.0 percent for establishing a 168-bit key between the transmitter and the receiver, and meanwhile the chance that the eavesdropper can infer the key in meter-order range of the receiver is subdued into the range of 0$\sim$∼0.10 percent.

中文翻译：

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利用信道操作的无线辅助密钥建立

由于无线媒体的广播特性，无线通信很容易被窃听。这激发了对使用无线信道物理层特性建立密钥的广泛研究。在所有这些方案中，密钥直接来源于真实无线信道的物理特征，其高度依赖于附近的通信环境。此外，以前的方案需要执行信息协调，这增加了成本和密钥泄漏的风险。在本文中，我们展示了一种新颖的无线密钥建立方法，允许发射器指定任意内容作为密钥，并使接收器利用信道操纵技术获得相同的密钥。我们还使发射器能够对密钥应用纠错码，以便接收器可以自动纠正任何不匹配的位，而无需通过公共信道将与密钥相关的信息发送回发送器。实验结果表明，我们的密钥建立方法在发送端和接收端之间建立168位密钥的成功率高达91.0%，同时窃听者可以在接收端米级范围内推断出密钥的机会被制服在 0 的范围内$\sim$～0.10%。