A Lightweight CP-ABE Scheme with Direct Attribute Revocation for Vehicular Ad Hoc Network

Area of Science:

• Computer Science
• Network Security
• Cryptography

Background:

• Vehicular ad hoc networks (VANETs) require secure data access control.
• Existing Ciphertext-Policy Attribute-Based Encryption (CP-ABE) schemes for VANETs face challenges with attribute revocation efficiency and computational overhead.
• Bilinear pairing operations in traditional CP-ABE schemes contribute to system complexity and reduced performance.

Purpose of the Study:

• To propose a lightweight CP-ABE scheme for VANETs that supports direct attribute revocation.
• To reduce system consumption and simplify revocation operations in VANETs.
• To improve the efficiency and reduce decryption costs for vehicular terminals.

Main Methods:

• Implemented an agent-based direct attribute revocation mechanism by differentiating dynamic and static vehicle attributes.
• Replaced computationally intensive bilinear pairing operations with efficient scalar multiplication on elliptic curves.
• Utilized computational outsourcing techniques to minimize decryption costs for vehicle terminals.

Main Results:

• The proposed scheme achieves direct attribute revocation, reducing system overhead and operational complexity.
• The use of elliptic curve scalar multiplication significantly enhances computational efficiency compared to bilinear pairings.
• Computational outsourcing effectively lowers the decryption burden on vehicle terminals.
• The scheme demonstrates improved overall efficiency while ensuring data confidentiality and integrity.

Conclusions:

• The developed lightweight CP-ABE scheme offers a more efficient and practical solution for secure access control in VANETs.
• The direct attribute revocation mechanism and optimized cryptographic operations address key limitations of existing schemes.
• This approach enhances the security and performance of vehicular communication systems.