Achievable Secrecy Rate Regions for the Two-Way Wiretap Channel
Achievable Secrecy Rate Regions for the Two-Way Wiretap Channel
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DOI：
10.1109/tit.2013.2281716
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发表时间：
2013-12-01
影响因子：
2.5
通讯作者：
El Gamal, Hesham
中科院分区：
文献类型：
--
作者：
El Gamal, Aly;Koyluoglu, Onur Ozan;El Gamal, Hesham
本文研究了双向窃听信道。两个合法用户Alice和Bob希望在被动窃听者Eve存在的情况下安全地交换消息。在每个节点都可以同时发送和接收的全双工场景中，除了密钥共享之外，还允许两个用户共同优化信道前缀分布和码本分组，从而获得新的可实现的保密率区域。对于一类广泛的离散无记忆信道和高斯信道，新区域被证明严格大于已知区域。在半双工的情况下，用户只能在任意给定的自由度上发送或接收，引入了随机调度的思想，并证明了它在可实现的保密和速率方面提供了显著的增益。基于近场无线通信场景，进一步开发了一种实际设置，并表明可以利用通信的双向特性，通过适当地随机化发射功率水平和传输调度，在无噪声的Eve中引入显著的模糊性。
The two-way wiretap channel is considered in this paper. Two legitimate users, Alice and Bob, wish to exchange messages securely in the presence of a passive eavesdropper Eve. In the full-duplex scenario, where each node can transmit and receive simultaneously, new achievable secrecy rate regions are obtained based on the idea of allowing the two users to jointly optimize their channel prefixing distributions and binning codebooks in addition to key sharing. The new regions are shown to be strictly larger than the known ones for a wide class of discrete memoryless and Gaussian channels. In the half-duplex case, where a user can only transmit or receive on any given degree of freedom, the idea of randomized scheduling is introduced and shown to offer a significant gain in terms of the achievable secrecy sum-rate. A practical setup is further developed based on a near field wireless communication scenario, and it is shown that one can exploit the two-way nature of the communication, via appropriately randomizing the transmit power levels and transmission schedule, to introduce significant ambiguity at a noiseless Eve.