Lightweight Advanced Encryption Standard for Privacy-Preserving Blockchain Healthcare Systems

Abstract

Blockchain is a secure, transparent digital ledger that reduces the need for a centralized authority to enable secure data transmission. Blockchain technology enhances security in healthcare by resolving key issues related to interoperability, privacy, and data security. Security hacks and third-party participation in medical data cause critical sharing issues with customized information on the internet, which results in security threats. To solve the issues, the method uses Lightweight Advanced Encryption Standard (LAES) method in this paper. To enhance the security, the four phases perform: block creation, key generation, data encryption & decryption, and key authentication. First, Proof of Secure Link (PoSL) is employed to create a secure and unalterable link between blocks, providing encrypted storage and transmission of medical records. Second, Random Key Generation (RKG) is used to create cryptographically secure random keys that secure sensitive health information while encrypting it. During the third stage, LAES is employed for data encryption and decryption in order to achieve robust security by utilizing symmetric encryption methods. Finally, Zero-Knowledge Proof (ZKP) is used for the verification of keys to validate secure verification of patient identity without disclosing personal information and, therefore, securing the patient's privacy while allowing access to legitimate users.