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An Access Control Scheme Based on Blockchain and Ciphertext Policy-Attribute Based Encryption.

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Summary
This summary is machine-generated.

This study introduces a novel blockchain and ciphertext policy-attribute-based encryption (CP-ABE) scheme for secure data sharing. It enhances efficiency and addresses privacy concerns in traditional CP-ABE systems.

Keywords:
access controlblockchainciphertext policy–attribute-based encryption (CP-ABE)policy updatingprivacy preserving

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Area of Science:

  • Cryptography and Information Security
  • Distributed Systems and Blockchain Technology

Background:

  • Traditional ciphertext policy-attribute-based encryption (CP-ABE) faces privacy risks and opaque verification due to reliance on third-party cloud providers for data storage and access control.
  • Existing CP-ABE schemes struggle with trust issues and privacy leakage in data-sharing environments.

Purpose of the Study:

  • To propose a novel access control scheme integrating blockchain and CP-ABE to enhance data security and privacy in data sharing.
  • To address the limitations of traditional CP-ABE by leveraging blockchain's decentralized and tamper-proof nature.
  • To introduce a scheme that supports multiple authorization centers and policy updating.

Main Methods:

  • Developed an access control scheme combining blockchain technology with ciphertext policy-attribute-based encryption (CP-ABE).
  • Utilized blockchain's distributed, decentralized, and tamper-proof features to establish trust in data sharing.
  • Implemented multiple authorization centers and supported dynamic policy updating within the CP-ABE framework.

Main Results:

  • The proposed scheme significantly improves computational efficiency by 18%, 26%, and 68% compared to existing methods.
  • Demonstrated the scheme's ability to satisfy indistinguishability under chosen-plaintext attack (IND-CPA), ensuring strong data confidentiality.
  • Successfully addressed the trust crisis and privacy leakage issues inherent in traditional CP-ABE data sharing.

Conclusions:

  • The integrated blockchain and CP-ABE scheme offers a robust solution for secure and efficient data sharing.
  • The decentralized and tamper-proof nature of blockchain enhances trust and transparency in access control.
  • The proposed scheme provides enhanced computational performance and security guarantees for fine-grained data access control.