CLOUD DATA PROTECTION FOR PERSONAL HEALTH RECORDS USING PROXY- ENCRYPTION BASED RABIN CERTIFICATELESS SIGNCRYPTION

Protecting cloud-based personal health records (PHRs) is critical to- ensuring privacy and data security for individuals in an era of rapidly growing digital healthcare systems. Traditional encryption methods face challenges in balancing computational efficiency with robust data protection. Proxy-based certificateless cryptography offers a promising solution by eliminating the need for certificate management while enabling seamless secure communication. In this work, a Proxy-Encryption Based Rabin Certificateless Signcryption (PERSC) scheme is proposed to enhance the security and efficiency of cloud-stored PHRs. The proposed method integrates proxy encryption with Rabin-based certificateless cryptography, leveraging its quadratic residue properties to secure key exchanges. A hybrid signcryption mechanism ensures data integrity and confidentiality while providing resistance against various attacks, including man-in-the-middle and key exposure attacks. This approach minimizes computational overhead, particularly on resource-constrained devices. Experimental results demonstrate that PERSC reduces encryption time by 38% compared to traditional certificateless cryptographic methods and achieves a 98.5% success rate in preventing unauthorized access. Additionally, PERSC’s decryption latency is reduced by 30%, making it suiTable.for real-time applications in cloud environments. The proposed framework ensures a balance between performance and security while providing a scalable solution for managing sensitive PHR data in the cloud. These findings underscore the feasibility of adopting advanced cryptographic techniques for cloud-based healthcare systems to meet increasing demands for secure and efficient data sharing.