Internet of Things (IoT) equipment is usually in a harsh environment, and its security has always been a widely concerned issue. Node identity authentication is an important means to ensure its security. Traditional IoT identity authentication protocols usually rely on trusted third parties. However, many IoT environments do not allow such conditions, and are prone to single point failure. Blockchain technology with decentralization features provides a new solution for distributed IoT system. In this paper, a blockchain based multi-WSN authentication scheme for IoT is proposed. The nodes of IoT are divided into base stations, cluster head nodes and ordinary nodes according to their capability differences, which are formed to a hierarchical network. A blockchain network is constructed among different types of nodes to form a hybrid blockchain model, including local chain and public chain. In this hybrid model, nodes identity mutual authentication in various communication scenarios is realized, ordinary node identity authentication operation is accomplished by local blockchain, and cluster head node identity authentication are realized in public blockchain. The analysis of security and performance shows that the scheme has comprehensive security and better performance.

中文翻译：

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一种基于混合区块链的多无线传感器网络身份认证方案

物联网（IoT）设备通常处于恶劣的环境中，其安全性一直是人们广泛关注的问题。节点身份认证是保证其安全的重要手段。传统的物联网身份认证协议通常依赖受信任的第三方。然而，许多物联网环境不允许这样的条件，并且容易出现单点故障。具有去中心化特征的区块链技术为分布式物联网系统提供了新的解决方案。在本文中，提出了一种基于区块链的物联网多 WSN 认证方案。物联网的节点根据能力差异分为基站、簇头节点和普通节点，形成分层网络。在不同类型的节点之间构建区块链网络，形成混合区块链模型，包括本地链和公链。在该混合模型中，实现了各种通信场景下的节点身份相互认证，普通节点身份认证操作由本地区块链完成，簇头节点身份认证在公共区块链中实现。安全性和性能分析表明，该方案具有全面的安全性和较好的性能。