With the advancement of Information and Communication Technology (ICT) and the proliferation of sensor technologies, the Internet of Things (IoT) is now being widely used in smart home for the purposes of efficient resource management and pervasive sensing. In smart homes, various IoT devices are connected to each other, and these connections are centered on gateways. The role of gateways in the smart homes is significant, however, its centralized structure presents multiple security vulnerabilities such as integrity, certification, and availability. To address these security vulnerabilities, in this paper, we propose a blockchain-based smart home gateway network that counters possible attacks on the gateway of smart homes. The network consists of three layers including device, gateway, and cloud layers. The blockchain technology is employed at the gateway layer wherein data is stored and exchanged in the form blocks of blockchain to support decentralization and overcome the problem from traditional centralized architecture. The blockchain ensures the integrity of the data inside and outside of the smart home and provides availability through authentication and efficient communication between network members. We implemented the proposed network on the Ethereum blockchain technology and evaluated in terms of standard security measures including security response time and accuracy. The evaluation results demonstrate that the proposed security solutions outperforms over the existing solutions.

随着信息和通信技术（ICT）的进步和传感器技术的普及，物联网（IoT）现已广泛应用于智能家居，以实现高效的资源管理和普适传感。在智能家居中，各种物联网设备相互连接，而这些连接以网关为中心。网关在智能家居中的作用非常重要，然而，其集中式结构存在多个安全漏洞，例如完整性、认证和可用性。为了解决这些安全漏洞，在本文中，我们提出了一种基于区块链的智能家居网关网络，以应对智能家居网关可能受到的攻击。网络由设备层、网关层、云层三层组成。网关层采用区块链技术，数据以区块链的形式存储和交换，支持去中心化，克服传统中心化架构的问题。区块链确保智能家居内部和外部数据的完整性，并通过网络成员之间的身份验证和高效通信提供可用性。我们在以太坊区块链技术上实施了拟议的网络，并根据标准安全措施（包括安全响应时间和准确性）进行了评估。评估结果表明，所提出的安全解决方案优于现有解决方案。