# Revocable and Traceable Decentralized ABE for P2P Networks

## TL;DR

This paper introduces a new decentralized encryption scheme for P2P networks that allows access control, revocation, and accountability while maintaining security and efficiency.

## Contribution

The novel R-T-D-ABE scheme introduces threshold key generation, versioned revocation, and identity-key binding for secure and efficient decentralized access control.

## Key findings

- The proposed scheme achieves IND-CPA security under the Generic Group Model.
- It provides efficient decentralized encryption and decryption with revocation and accountability.
- The system resists collusion attacks and ensures forward/backward security.

## Abstract

Ciphertext-Policy Attribute-Based Encryption (CP-ABE) technology provides fine-grained access control capabilities for P2P networks. However, its long-term development has been constrained by three major challenges: the trade-off between computational efficiency and functional completeness, decentralized trust security issues, and the problems of attribute revocation and traceability. This paper proposes a decentralized CP-ABE scheme based on multiple authorities (R-T-D-ABE). By leveraging three core techniques, including threshold distributed key generation, versioned attribute revocation, and identity-key binding verification, the scheme efficiently achieves both revocation and accountability while ensuring resistance against collusion attacks and forward/backward security. Security analysis demonstrates that the proposed scheme satisfies IND-CPA security under the Generic Group Model (GGM). Experimental results indicate that it not only guarantees efficient decentralized encryption and decryption but also realizes the dual functions of revocation and accountability, thereby providing a functionally complete and efficient access control solution for P2P networks.