Open AccessPrivacy Preservation for On-Chain Data in the Permission less Blockchain using Symmetric Key Encryption and Smart Contract
Author(s) -
Riaz Ahmad Ziar,
Syed Irfanullah,
Wajid Khan,
Abdus Salam
Publication year - 2021
Publication title -
mehran university research journal of engineering and technology
Language(s) - English
Resource type - Journals
eISSN - 2413-7219
pISSN - 0254-7821
DOI - 10.22581/muet1982.2102.05
Subject(s) - computer security , computer science , smart contract , permission , encryption , access control , blockchain , cryptography , information privacy , consumer privacy , key (lock) , internet privacy , verifiable secret sharing , database transaction , data security , database , set (abstract data type) , political science , law , programming language
Blockchain technology provides several suitable characteristics such as immutability, decentralization and verifiable ledger. It records the transactions in a decentralized way and can be integrated into several fields like eHealth, e-Government and smart cities etc. However, blockchain has several privacy and security issues, one of them is the on-chain data privacy. To deal with this issue we provide a privacy-preserving solution for permission less blockchain to empower the user to take control of transaction data in the open ledger. This work focuses on designing and developing the peer-to-peer system using symmetric cryptography and ethereum smart contract. In this scheme, we create smart contracts for the interaction of the data provider, data consumer, and access control list. Data providers register authorized users in the access control list. Data consumers can check their validity in the access control list. After successful validation, data consumers can request the security key from data providers to access secret information. Based on successful validation, a smart contract that is created between the data provider and data consumer is executed to send a key to the data consumer for accessing the secret information. The smart contracts of this proposed model are modeled in solidity, and the performance of the contracts is assessed in the Ropsten test network.