Design and Implementation of Blockchain Based Single Sign-On Authentication System for Web Applications

Today, many services are provided through web applications and the number of these applications is increasing rapidly. Nowadays, most users use their username and password to login to web applications. Many of these users also use the same login information in different applications. This causes a major security vulnerability for applications and users. As a solution to these weaknesses in the field of authentication, there have been many developments in recent years. Some of these studies have been third party identity authentication systems like Google and Facebook. Since this method also contains potential risks, studies have been conducted on the TwoFactor Authentication (2FA) method for more security. In parallel with the innovations that emerge every day, methods should be used in the field of authentication. In these times, blockchain technology offers solutions that make life easier in many areas thanks to its distributed, transparent, secure and immutable structure. In this study, blockchain based single sign-on (SSO) authentication system was developed and implemented for web applications. In this system, a public address and a private key are defined on the private blockchain network for users and this information is used for the 2FA method through the developed mobile application. Detailed information was given about the proposed system and technologies used in the study.