ER-CGKA: Efficient and robust continuous group key agreement scheme with post-compromise forward security for IoV

Area of Science:

• Cybersecurity
• Intelligent Transportation Systems
• Network Security

Background:

• Internet of Vehicles (IoV) communication is vital for intelligent transportation but vulnerable to malicious attacks.
• Existing authentication protocols struggle to guarantee post-compromise forward security (PCFS) when group members are compromised.
• Dynamic key rotation for PCFS incurs significant computational and communication overhead.

Purpose of the Study:

• To design an efficient and robust continuous group key agreement (ER-CGKA) scheme for IoV.
• To address the challenge of achieving PCFS in compromised IoV environments.
• To reduce the computational and communication burden associated with secure key agreement.

Main Methods:

• Employed a propose-and-commit flow for asynchronous group key updates.
• Utilized the TreeKEM architecture to minimize computation cost and communication overhead.
• Integrated a threshold mechanism to defend against collusion attacks from malicious vehicles.

Main Results:

• The proposed ER-CGKA scheme satisfies fundamental IoV security requirements and achieves PCFS.
• Demonstrated significant reductions in computation cost: approximately 18.82% for clients and 33.18% for cloud servers (CS).
• Observed an approximate 55.57% increase in communication overhead due to the use of pseudonyms for privacy preservation.

Conclusions:

• The ER-CGKA scheme offers a secure and practical solution for key agreement in IoV.
• The scheme effectively enhances security and privacy while managing computational and communication efficiency.
• The findings contribute to more secure and reliable intelligent transportation systems.