Encrypted-OFDM: A secured wireless waveform

IF 4.4 2区 计算机科学 Q1 COMPUTER SCIENCE, HARDWARE & ARCHITECTURE
Hesham Mohammed, Dola Saha
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引用次数: 0

Abstract

Wireless communication has been a broadcast system since its inception, which violates security and privacy issues at the physical layer between the intended transmit and receive pairs. Consequently, it is essential to secure the wireless signal such that only the intended receiver can realize the signal properties. In this paper, we propose Encrypted-OFDM, a new waveform, where the signal structure is altered to encrypt the waveform with a shared secret key. We achieve the signal level security by modifying the OFDM signal in time-domain, thus erasing the OFDM properties and obfuscating the signal properties to an eavesdropper. We present a two-stage encryption algorithm to increase the robustness of the transmitted waveform and achieve a high level of secrecy, even when low entropy keys are used. We also introduce a novel channel estimation algorithm by removing the pilots, so that only the intended receiver can estimate the channel correctly. Furthermore, we perform both secrecy and error analysis for the transmitted and received Encrypted-OFDM waveform. Extensive simulation and over-the-air experiments show that the performance of Encrypted-OFDM is comparable to legacy OFDM, and the SNR penalty due to the secured waveform varies between 1–4 dB. In all these scenarios, Encrypted-OFDM remains unrecognized at the eavesdropper.
加密-OFDM:一种安全的无线波形
无线通信自诞生以来一直是一种广播系统,这就在物理层上违反了预定发射和接收对之间的安全和隐私问题。因此,必须确保无线信号的安全,只有目标接收器才能实现信号特性。在本文中,我们提出了加密波分复用技术(Encrypted-OFDM),这是一种新的波形,通过改变信号结构,用共享密钥对波形进行加密。我们通过在时域上修改 OFDM 信号来实现信号级安全,从而消除 OFDM 特性,并对窃听者混淆信号特性。我们提出了一种两阶段加密算法,以提高传输波形的鲁棒性,即使使用低熵密钥也能实现高度保密。我们还引入了一种新颖的信道估计算法,通过去除先导信号,只有目标接收器才能正确估计信道。此外,我们还对发送和接收的加密-OFDM 波形进行了保密和误差分析。广泛的仿真和空中实验表明,加密-OFDM 的性能与传统 OFDM 不相上下,加密波形造成的信噪比损失在 ≈ 1-4 dB 之间。在所有这些情况下,加密 OFDM 都不会被窃听者识别。
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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来源期刊
Computer Networks
Computer Networks 工程技术-电信学
CiteScore
10.80
自引率
3.60%
发文量
434
审稿时长
8.6 months
期刊介绍: Computer Networks is an international, archival journal providing a publication vehicle for complete coverage of all topics of interest to those involved in the computer communications networking area. The audience includes researchers, managers and operators of networks as well as designers and implementors. The Editorial Board will consider any material for publication that is of interest to those groups.
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