Wiretap Code Design by Neural Network Autoencoders
Wiretap Code Design by Neural Network Autoencoders
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DOI：
10.1109/tifs.2019.2945619
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发表时间：
2020
影响因子：
6.8
通讯作者：
Karl-Ludwig Besser;Pin-Hsun Lin;C. Janda;Eduard Axel Jorswieck
中科院分区：
文献类型：
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作者：
Karl-Ludwig Besser;Pin-Hsun Lin;C. Janda;Eduard Axel Jorswieck
在工业机器类型通信中，越来越多的无线设备同时在可靠性、延迟和机密性约束下进行通信。根据信息理论，已知窃听码可以渐进地实现可靠性（在合法接收器Bob处的块错误率（BLER）消失），同时还实现保密性（对窃听者Eve的信息泄漏（IL）消失）。然而，在有限块长度下，在Bob处的BLER和Eve处的IL之间存在折衷。在这项工作中，我们提出了一个灵活的窃听码设计退化的高斯窃听信道有限块长度下，它可以改变工作点上的Pareto边界的BLER和IL之间的权衡给定特定的代码参数。为了实现这一目标，我们制定了一个多目标规划问题，它需要在鲍勃的BLER和IL在前夕考虑。在训练过程中，我们用均方误差来逼近误块率，用基于詹森不等式和泰勒展开的方法来逼近白介素，然后用神经网络自编码器来解决优化问题。仿真结果表明，该方案可以找到性能优于极性窃听码（PWC）的BLER和IL的同时。我们表明，由自动编码器发现的代码可以实现与真实的调制方案，只有很小的损失的性能。
In industrial machine type communications, an increasing number of wireless devices communicate under reliability, latency, and confidentiality constraints, simultaneously. From information theory, it is known that wiretap codes can asymptotically achieve reliability (vanishing block error rate (BLER) at the legitimate receiver Bob) while also achieving secrecy (vanishing information leakage (IL) to an eavesdropper Eve). However, under finite block length, there exists a tradeoff between the BLER at Bob and the IL at Eve. In this work, we propose a flexible wiretap code design for degraded Gaussian wiretap channels under finite block length, which can change the operating point on the Pareto boundary of the tradeoff between BLER and IL given specific code parameters. To attain this goal, we formulate a multi-objective programming problem, which takes the BLER at Bob and the IL at Eve into account. During training, we approximate the BLER by the mean square error and the IL by schemes based on Jensen’s inequality and the Taylor expansion and then solve the optimization problem by neural network autoencoders. Simulation results show that the proposed scheme can find codes outperforming polar wiretap codes (PWC) with respect to both BLER and IL simultaneously. We show that the codes found by the autoencoders could be implemented with real modulation schemes with only small losses in performance.