Secret-key sharing based on layered broadcast coding over fading channels

Xiaojun Tang, Ruoheng Liu, P. Spasojevic
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引用次数: 8

Abstract

A secret-key sharing strategy based on layered broadcast coding is introduced for slow fading channels. In the model considered, Alice wants to share a key with Bob while keeping the key secret from a passive eavesdropper, Eve. Both Alice-Bob and Alice-Eve channels are assumed to undergo slow fading, and perfect channel state information (CSI) is assumed to be known only at the receivers during the transmission. Layered coding facilitates adapting the reliably decoded rate at Bob to the actual channel state without CSI available at Alice. The index of a reliably decoded layer is sent back to Alice via a public and error-free channel, which is exploited by Alice and Bob to generate the secret key. In this paper, the secrecy key rate is derived. In addition, the optimal power distribution over coded layers is characterized. It is shown that layered coding can increase the secrecy key rate significantly compared with single-level coding.
基于衰落信道分层广播编码的密钥共享
针对慢衰落信道,提出了一种基于分层广播编码的密钥共享策略。在考虑的模型中,Alice希望与Bob共享密钥,同时对被动窃听者Eve保密。假设Alice-Bob和Alice-Eve信道都经历缓慢衰落,并且假设在传输过程中只有接收器知道完美信道状态信息(CSI)。分层编码有助于使Bob的可靠解码速率适应实际信道状态,而无需在Alice处使用CSI。可靠解码层的索引通过一个公共且无错误的通道发送回Alice, Alice和Bob利用该通道生成密钥。本文推导了保密密钥速率。此外,还描述了编码层上的最优功率分布。结果表明,与单级编码相比,分层编码能显著提高密钥率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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