A Secure Blockchain-Based Authentication and Key Agreement Scheme for 3GPP 5G Networks.

Area of Science:

• Computer Science
• Cybersecurity
• Telecommunications Engineering

Background:

• The fifth-generation cellular network (5G) requires robust security for high-speed internet and numerous simultaneous device connections.
• The current 5G Authentication and Key Agreement (5G-AKA) protocol faces vulnerabilities to linkability, denial-of-service (DoS), and distributed denial-of-service (DDoS) attacks.
• A decentralized approach is needed to overcome the single-point-of-failure inherent in centralized authentication systems.

Purpose of the Study:

• To propose a novel Secure Blockchain-based Authentication and Key Agreement for 5G Networks (5GSBA) protocol.
• To enhance the security, robustness, and anonymity of 5G networks against prevalent cyber threats.
• To improve upon the existing 5G-AKA protocol by addressing its identified security weaknesses.

Main Methods:

• Implemented a decentralized authentication system using blockchain technology, distributing functions across base stations.
• Employed a one-time secret hash function for device secret keys to prevent impersonation.
• Utilized Subscription Concealed Identifiers (SUCI) for device identity encryption and Elliptic Curve Diffie-Hellman (ECDH) to prevent linkability attacks.
• Formally verified the protocol using Burrows-Abadi-Needham (BAN) logic and the Scyther tool.

Main Results:

• 5GSBA demonstrates superiority over 5G-AKA in perfect forward secrecy, device anonymity, and mutual authentication.
• The protocol effectively mitigates linkability, replay, DoS, and DDoS attacks.
• Performance evaluations indicate 5GSBA is efficient for both user equipment (UE) and base stations, with low computational costs and energy consumption.

Conclusions:

• The proposed 5GSBA protocol offers a significant improvement in 5G network security by leveraging blockchain's decentralized nature.
• 5GSBA provides enhanced protection against critical attacks, ensuring a more secure and reliable 5G infrastructure.
• The protocol's efficiency makes it a practical solution for real-world 5G network deployments.