24. Single Sign-On (SSO) Fingerprint Authentication Using Blockchain

The chapter delves into the concept of Single Sign-On (SSO) and its integration with blockchain technology for secure fingerprint authentication. It begins by discussing the limitations of traditional centralized authentication systems and the vulnerabilities they present. The authors then introduce the benefits of using blockchain for authentication, such as data tamper resistance, decentralization, and high concurrency. The core of the chapter focuses on the implementation of a web application that uses Ethereum for user management and authentication. The application employs fingerprint images as biometric data, with a similarity score threshold for successful authentication. The backend of the application is built using Springboot and communicates with the Ethereum network through smart contracts. The frontend supports user registration and authentication, demonstrating the potential of blockchain to enhance security in biometric-based authentication systems. The chapter concludes with a discussion on future directions and potential improvements, such as implementing microservices architecture and enterprise blockchain solutions.