An Efficient and Generic Construction of Public Key Encryption with Equality Test Under the Random Oracle Model

Aim

         To implement a secure hospital data management system by adapting the Public Key Encryption with Equality Test (PKE-ET) framework, ensuring encrypted storage, duplication-free records, and efficient retrieval in a cloud environment.

Abstract

            This project presents a secure and efficient hospital data management framework inspired by the paper “An Efficient and Generic Construction of Public Key Encryption with Equality Test under the Random Oracle Model” (Choi et al., 2025). The proposed system integrates PKE-ET with Quantum Key Distribution (QKD) to ensure confidentiality, duplication control, and reliable retrieval of patient data stored in the cloud. The architecture is composed of three portals: (1) Admin Portal for key generation, equality testing, and decryption; (2) Data Entry Server for encrypting and uploading patient records as JSON; and (3) Trapdoor Server, which securely receives session keys via Quantum E91 and validates duplicates before storage. The system ensures that duplicate or outdated data are replaced while maintaining backups of older records. By applying cryptographic equality tests, doctors can securely retrieve patient information using encrypted patient IDs. Compared to existing PKE-ET frameworks, our system adapts the concept for real-world hospital environments, improving data confidentiality, integrity, and efficiency in patient record management.

Proposed System

       We extend PKE-ET by designing a hospital data management system that includes:

• Public key encryption of patient records at the Data Entry Server,
• Secure transfer of session keys using Quantum E91,
• Trapdoor-based duplicate detection before committing data to the database, and
• Equality-test–based retrieval of patient records through Admin Portal.

Advantage

• Adapts PKE-ET to real-world hospital data storage.
• Prevents duplicate or redundant records.
• Secure trapdoor sharing using quantum protocols.
• Maintains backups of older patient data.
• Enables encrypted patient ID–based equality testing for efficient retrieval.