PRBPR: Privacy-Preserving Redactable Blockchain Supporting Policy Hiding and Revocation
Summary
This research proposes PRBPR, a privacy-preserving redactable blockchain system that addresses conflicts between blockchain immutability and regulations like GDPR's right to be forgotten. The scheme combines hierarchical blinding factors (mathematical techniques for hiding information), chameleon hash trapdoors (special keys that allow controlled modification of blockchain records), and ciphertext-policy attribute-based encryption (encryption that grants access based on user attributes while hiding who can access data) to enable efficient data deletion, fine-grained access control, and auditability while maintaining security in multi-party data sharing.
Solution / Mitigation
The proposed PRBPR scheme itself is the solution: it integrates a hierarchical blinding factor to enable dynamic expiration of chameleon hash trapdoors for efficient batch revocation, uses CP-ABE with lightweight inner-product encoding for fine-grained authorization while concealing access policies, and includes a revocation and traceability framework that guarantees immediate permission invalidation, tamper-evident auditing, and consistent synchronization between on-chain and off-chain data. The scheme reportedly achieves up to 7.7x higher efficiency and reduces computational cost by 66.8% compared to existing redactable blockchain approaches.
Classification
Original source: http://ieeexplore.ieee.org/document/11579424
First tracked: July 6, 2026 at 08:03 PM
Classified by LLM (prompt v3) · confidence: 85%