Abstract: As a large number of mobile terminals are connected to the Internet of Things for information exchange and communication、 identity authentication、data transmission、single point of failure and other security problems are exposed, the security problem of the Internet of Things is a challenge to the Internet of Things technology. Because the traditional security technology is mostly based on the centralization system and the limitation of the topology structure of the Internet of Things, the traditional security technology can only be applied to specific industries. Block chain technology has the characteristics of decentralization, data encryption, smart contract and so on, especially suitable in the complex heterogeneous network. Based on the research of block chain security mechanism and elliptic curve digital signature, the Internet of Things model based on block chain technology is proposed. Based on the security problems faced by the Internet of Things and the block chain technology, this paper studies the characteristics of the application of block chain in the Internet of Things, and proposes the Internet of Things model based on the block chain technology, so as to provide reference for enterprise security.

Key words: IOT, block chain, smart contract, decentralization, security issues

摘要： 随着大量移动终端接入物联网进行信息交换和信息通信的过程中暴露出身份认证、数据传输、单点故障等安全问题，物联网安全问题是物联网技术所面临的挑战.由于传统的安全技术大多基于中心化体系以及物联网拓扑结构的限制，传统的安全技术只能适用于特定行业.区块链技术具有去中心化、数据加密、智能合约等特点，尤其适合在复杂的异构网络.基于对区块链安全机制和椭圆曲线数字签名的研究，提出了基于区块链技术的物联网模型.本文以物联网面临的安全问题和区块链技术和为基础，研究区块链在物联网中应用的特点，提出基于区块链技术的物联网模型，为企业安全提供参考.

关键词: 物联网, 区块链, 智能合约, 去中心化, 安全问题