Data Encryption of Blood-chain data in Blockchain Network

Blockchain technology is more advantageous in supply chain management since there is a constant need to record the transaction history of each node/party in the blockchain network. One such example is storage of blood donation and transfusion data on blockchain. As multiple parties such as blood donor, blood bank and hospital are involved, it is necessary to keep the part of their transactional data (such as donor’s personal data, patient’s personal data) as confidential. Hence in this paper, with the intension to provide more data confidentiality and security, the popular data encryption algorithm ‘Advanced Encryption Standard (AES)’, a symmetric key crypto-system is employed on part of blood-chain data before sending transactions to the ordering service and adding blocks to the ledger. Therefore, only a person who has access to the appropriate key that was used to create the cipher text can decrypt the encrypted data. In addition, the performance of the transaction using different parameters such as data encryption/decryption speed, storage is evaluated using Hyperledger Caliper Tool.