Secure and robust symmetric key generation using physical layer techniques under various wireless environments
Secure and robust symmetric key generation using physical layer techniques under various wireless environments
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DOI：
10.1109/rws.2016.7444407
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Cem Sahin;Brandon Katz;K. Dandekar
中科院分区：
文献类型：
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作者：
Cem Sahin;Brandon Katz;K. Dandekar
由于无线无线电频谱不可避免地具有共享性，为无线通信提供安全是一项独特的挑战。加密密钥已用作保护无线网络的主要技术，但并不是完全安全的。用于加密目的的对称密钥容易受到中间人和暴力攻击。最近，基于物理层的技术得到了极大的关注，其中利用了信道互易性的原理和测量的无线信道的自然随机性来生成密钥。虽然在以前的文献中已经研究和提出了PHY层密钥生成，但是关于在链路两端获得对称密钥的讨论一直很少。在这项工作中，我们提出了一种新的物理层密钥生成技术，该技术旨在获得对称的加密密钥，同时限制泄露给窃听者的信息，以确保完全保密，并防止潜在的智能攻击。我们的算法利用给定无线链路中的前向和后向信道状态信息，并通过生成信道趋势信息来对抗在这些链路对中观察到的微小差异。我们使用连接到无线信道仿真器的实时SDR试验台的实验结果来演示我们的技术。我们的结果表明，该算法能够在各种无线环境下成功地生成对称密钥，而不会通过公开的无线信道泄露任何与密钥有关的信息。我们的密钥提取速率可以达到17.3Kbps以上。
Due to the unavoidable shared nature of the wireless radio spectrum, providing security for wireless communications presents unique challenges. Cryptographic keys have been used as a primary technique for securing wireless networks but are not completely secure. The symmetric keys used for cryptographic purposes are vulnerable to man-in-the-middle and brute force attacks. More recently, PHY-layer based techniques have gained significant attention, where the principle of channel reciprocity and the natural randomness of the measured wireless channel to generate secret keys is leveraged. Although, PHY-layer secret key generation has been investigated and presented in the literature before, there has been a lack of discussion in terms of obtaining symmetric keys on both ends of the link. In this work, we present a novel PHY-layer secret key generation technique that aims for symmetric encryption keys while limiting the information leaked to an eavesdropper to ensure complete secrecy and to prevent potential intelligent attacks. Our algorithm utilizes forward and backward channel state information in a given wireless link and combats the minute differences observed in these pairs by generating channel trend information. We demonstrate our technique using experimental results from a realtime SDR testbed connected to a wireless channel emulator. Our results indicate that the algorithm is successful in generating symmetric keys under various wireless environments without revealing any information pertaining to the key via the open wireless channel. Our secret key extraction rate can reach values in excess of 17.3 Kbps.