Circuit Ciphertext-Policy Attribute-Based Hybrid Encryption with Verifiable Delegation in Cloud Computing

Abstract

This research proposes a novel circuit ciphertext-policy attribute-based hybrid encryption (CP-ABE) scheme with verifiable delegation for secure data sharing in cloud computing. The scheme combines the fine-grained access control of CP-ABE with the efficiency of hybrid encryption, addressing the limitations of existing approaches. A verifiable delegation mechanism ensures the integrity and authenticity of delegated decryption keys. Our evaluation demonstrates improved performance and enhanced security compared to existing methods, enabling secure and efficient data management in cloud environments with strong accountability.

Introduction

Cloud computing offers scalable and cost-effective data storage, but secure data sharing remains a critical challenge. Traditional encryption methods lack the flexibility to control access based on complex user attributes. Attribute-based encryption (ABE) provides a solution, allowing data access to be controlled based on user attributes rather than identities. However, existing ABE schemes often suffer from performance limitations, particularly with complex access policies. Hybrid encryption, combining symmetric and asymmetric encryption, can mitigate this. This research addresses the need for a secure and efficient solution combining the benefits of CP-ABE and hybrid encryption with a verifiable delegation mechanism for enhanced security and accountability in cloud data management.

Objectives

• Design a secure and efficient circuit-based CP-ABE hybrid encryption scheme.
• Implement a verifiable delegation mechanism for delegated decryption.
• Evaluate the performance and security of the proposed scheme.