Self-organizing networks provide rapid and convenient networking for many situations and have gained extensive research. With the progress of researches, security issues have attracted people's attention. There is no central node in self-organizing networks, and therefore the traditional key distribution methods based on public infrastructure do not work. The standardized pre-shared keys have predictable security risks. The physical-layer secret key generation has become a technology worth considering due to its lightweight, security, and decentralization. However, most of the previous work has focused on two devices, and remains a challenge to expand the pairwise key into the group key. Since the channel reciprocity only exists between two devices, some information would be exchanged on the unencrypted channel, causing information leakage. This paper designs a secure communication system in self-organizing networks. It adopts an adaptive quantizer to generate the pairwise keys and proposes DORCE, Difference Of quantization Results at one deviCE. The authenticated users share the group key via the difference between pairwise keys. The algorithm is implemented in a mesh topology, which is suitable for self-organizing networks because users' joining and leaving will not have a great impact on the network topology. The algorithm's Key Achievable Rate is up to 4 bits. Experimental results demonstrate that DORCE can generate the group keys in seconds. The Key Generation Rate is above 10 bits per second, enabling a group key generation to be used in a communication system for self-organizing networks. All the generated keys pass the NIST Statistical Test Suite.

中文翻译：

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通过轻量级组密钥生成的自组织网络中的安全通信系统


自组织网络为许多情况提供了快速便捷的联网，并得到了广泛的研究。随着研究的进展，安全问题引起了人们的关注。自组织网络没有中心节点，因此基于公共基础设施的传统密钥分发方法不起作用。标准化的预共享密钥具有可预见的安全风险。物理层密钥生成因其轻量、安全、去中心化等特点成为值得考虑的技术。然而，之前的大部分工作都集中在两个设备上，将成对密钥扩展到组密钥仍然是一个挑战。由于信道互易性仅存在于两个设备之间，因此一些信息会在未加密的信道上交换，从而导致信息泄漏。本文设计了一种自组织网络中的安全通信系统。它采用自适应量化器来生成成对密钥，并提出 DORCE（在一台设备上量化结果的差异）。经过身份验证的用户通过成对密钥之间的差异共享组密钥。该算法在网状拓扑中实现，适合自组织网络，因为用户的加入和离开不会对网络拓扑产生很大的影响。该算法的密钥可实现速率高达 4 位。实验结果表明，DORCE 可以在几秒钟内生成组密钥。密钥生成速率高于每秒 10 位，使得组密钥生成能够用于自组织网络的通信系统中。所有生成的密钥都通过了 NIST 统计测试套件。