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Updated: Aug 26, 2025

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A revocable attribute-based encryption EHR sharing scheme with multiple authorities in blockchain.

Xiaohui Yang1, Wenjie Li1,2, Kai Fan2

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Summary
This summary is machine-generated.

This study introduces a secure electronic health record (EHR) sharing system using blockchain and multi-authority, attribute-based encryption (CP-ABE). It enhances data privacy and reduces computational costs for users.

Keywords:
Attribute-based encryptionBlockchainData sharingEHR sharing

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Area of Science:

  • Computer Science
  • Information Security
  • Healthcare Informatics

Background:

  • Digital healthcare relies on secure electronic medical record (EHR) data sharing.
  • Current CP-ABE schemes suffer from centralized authority and untrusted cloud servers.
  • Need for enhanced security and efficiency in EHR sharing systems.

Purpose of the Study:

  • To design a revocable CP-ABE EHR sharing scheme with multiple authorities (MA-RABE) utilizing blockchain.
  • To address the limitations of single-authority CP-ABE and enhance data security in cloud environments.
  • To improve efficiency and reduce computational overhead in EHR data access.

Main Methods:

  • Implemented a multi-authority CP-ABE scheme (MA-RABE) on a blockchain.
  • Utilized secret sharing and transactions for attribute distribution, key generation, and user management.
  • Introduced a distributed one-way anonymous key agreement for policy hiding.
  • Enabled cloud server pre-decryption to minimize user decryption overhead.

Main Results:

  • The proposed MA-RABE scheme ensures secure EHR sharing with enhanced privacy.
  • Achieved distributed attribute management and key generation through blockchain transactions.
  • Demonstrated reduced computational overhead for data users via cloud server pre-decryption.
  • Showcased reliable security with lower user revocation and ciphertext update costs.

Conclusions:

  • The MA-RABE scheme offers a secure and efficient solution for EHR data sharing.
  • Blockchain integration enhances data integrity and decentralized control.
  • The scheme effectively mitigates risks associated with centralized authorities and untrusted cloud servers.
  • This approach represents a significant advancement in secure digital healthcare data management.