Blockchain-based Privacy Preservation Framework for IoT-Based Information Systems

IoT-based systems have become an important part of our lives. We interact with these types of systems many times in a single day like smart watches, smart home systems, smart vehicle systems, and more. Mostly they perform their functionality by utilizing our data. This data is stored on a central repository mostly a cloud-based repository. This central storage mechanism has many critical data privacy issues with it. To resolve these privacy-related issues, a blockchain-based framework is proposed that stores data on distributed ledger instead of any central location. The proposed framework categorizes participants into trusted participants that are mostly data owners and the other is untrusted. It is based on two separate blockchain networks. One is the main chain that is utilized for the transactions related to data storage and the other is a side chain that is utilized for the transaction related to access policy. In this way, transactions take place on the network without any miscellaneous data or privacy threats.