Secure Outsourced Blockchain-Based Medical Data Sharing System Using Proxy Re-Encryption

Abstract

The security and privacy of electronic health records (EHRs) have received considerable attention from healthcare workers and researchers. To ensure security, various encryption and decryption schemes as well as key management protocols have been developed. However, owing to sharing and scalability issues, additional security technologies have been proposed. Nonetheless, these technologies cause other problems, such as efficiency issues. Blockchain-based EHR management systems have been proposed to overcome computational overhead. However, because most blockchain systems are installed by outsourcing companies, EHRs may be leaked to the company. Hence, we herein propose a blockchain-based EHR management scheme with proxy re-encryption. In this scheme, we set a proxy server that re-encrypts the ciphertext between file servers, thereby solving EHR sharing issues. Furthermore, because the server is separated from the blockchain system, the outsourcing company cannot manipulate the server or access the records. In addition, the blockchain assists in access control by using smart contracts, thereby enabling secure and efficient EHR sharing. By performing security analysis, we prove that our proposed scheme solves the aforementioned security problems. In addition, we experimentally demonstrate the efficient operation of the proposed system.

Explorando los Principales Atributos de Blockchain para la protección de Datos médicos: Una Revisión Sistemática

“…• Invariabilidad de datos: así como es su ventaja, a su vez puede ser lo contrario, esto debido al momento en que las personas erran en registrar información, generando así problemas en la realidad, dado que los datos no podrán ser editada [22].…”

A blockchain-based traceable and secure data-sharing scheme

“…However, the RSA asymmetric encryption algorithm has low efficiency, which affects system performance. Park et al (2021) proposed the Medchain architecture, which uses proxy re-encryption to protect patient privacy. The patient’s private data is re-encrypted by a cloud-based proxy server node, which is vulnerable to attacks and poses a single point of failure risk.…”

“…6 and 7 for encryption and decryption overhead of original data, respectively. Additionally, to test the performance of the proposed scheme during encryption and decryption of original data, it was compared to the schemes proposed by Dong et al (2020) and Park et al (2021) . Dong et al (2020) proposed the use of AES symmetric encryption algorithm, while Park et al (2021) suggested the use of proxy re-encryption technique for data privacy protection.…”

“…Additionally, to test the performance of the proposed scheme during encryption and decryption of original data, it was compared to the schemes proposed by Dong et al (2020) and Park et al (2021) . Dong et al (2020) proposed the use of AES symmetric encryption algorithm, while Park et al (2021) suggested the use of proxy re-encryption technique for data privacy protection. These two schemes were proposed recently and are similar to the technical architecture of the proposed option.…”

An Efficient Code-Embedding-Based Vulnerability Detection Model for Ethereum Smart Contracts

“…algorithms (Fu et al, 2021), and the distributed storage of data through P2P networks. Due to its advantages in decentralization and traceability and immutability, blockchain technology has been widely used in industries such as information sharing (Park et al, 2021), product traceability , copyright protection (Liu et al, 2021), supply chain (Pournader et al, 2020), and finance (Kowalski et al, 2021). Currently, the development of blockchain is divided into three stages: blockchain 1.0, blockchain 2.0, and blockchain 3.0.…”