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Physical Layer Security over Wiretap Channels with Random Parameters

机译:带有随机参数的窃听通道上的物理层安全性

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We study semantically secure communication over state dependent (SD) wiretap channels (WTCs) with non-causal channel state information (CSI) at the encoder. This model subsumes all other instances of CSI availability as special cases, and calls for an efficient utilization of the state sequence both for reliability and security purposes. A lower bound on the secrecy-capacity, that improves upon the previously best known result by Chen and Han Vinck, is derived based on a novel superposition coding scheme. The improvement over the Chen and Han Vinck result is strict for some SD-WTCs. Specializing the lower bound to the case where CSI is also available to the decoder reveals that it is at least as good as the achievable formula by Chia and El-Gamal, which is already known to outperform the adaptation of the Chen and Han Vinck code to the encoder and decoder CSI scenario. The results are derived under the strict semantic security metric that requires negligible information leakage for all message distributions. The proof of achievability relies on a stronger version of the soft-covering lemma for superposition codes. The lower bound is shown to be tight for a class of reversely less-noisy SD-WTCs, thus characterizing the fundamental limit of reliable a secure communication. An explicit coding scheme that includes a key extraction phase via the random state sequence is also proposed.
机译:我们研究了编码器上具有非因果信道状态信息(CSI)的状态依赖(SD)窃听信道(WTC)上的语义安全通信。此模型将CSI可用性的所有其他实例都包含为特殊情况,并要求出于可靠性和安全性目的而有效利用状态序列。基于一种新颖的叠加编码方案,得出了保密容量的下限,该下限是Chen和Han Vinck先前最著名的结果的改进。对于某些SD-WTC,对Chen和Han Vinck结果的改进是严格的。将下限专门化到解码器也可以使用CSI的情况,可以发现它至少与Chia和El-Gamal可以实现的公式一样好,众所周知,该公式的性能优于Chen和Han Vinck编码对编码器和解码器CSI方案。结果是在严格的语义安全性度量标准下得出的,该度量标准要求所有消息分发的信息泄漏都可以忽略不计。可实现性的证明依赖于叠加代码的软覆盖引理的增强版本。对于一类反向噪声较小的SD-WTC,该下限显示得很紧,因此表征了可靠安全通信的基本限制。还提出了包括经由随机状态序列的密钥提取阶段的显式编码方案。

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