Blockchain based decentralized identity system for internet of things devices

It is estimated that there will be more than 30 billion IoT (Internet of Things) devices worldwide by 2025. This rapid increase makes it difficult to design an Identity and Access Management (IAM) system that can be used jointly by all devices within the network. Blockchain technology offers a promising solution for IoT IAM systems due to its decentralization, immutability and cryptographic features. This thesis proposes a fully blockchain-based IAM and trust assessment framework for IoT by utilizing smart contracts. The proposed framework redesigns core IoT IAM functions such as authorization, authentication, auditing, and identity management in a decentralized manner. Additionally, a trust assessment mechanism that allows devices to evaluate each other's trustworthiness, which is not available in traditional IoT IAM systems, is also included in the framework.