Decentralised Implementation of OAuth2 using Blockchain and Decentralized IdentitiesGOLINAR, LUKA (Avtor) Jurič, Branko Matjaž (Mentor) decentralized identitiesverifiable credentialsKilt protocolOAuth 2.0Digital data has become one of the most important assets in the world. Existing identity providers follow a federative approach to processing user data. The decentralized identity standard aims to provide users with com- plete control over their data without the need for a third party. Various solutions are proposed, such as data storage in blockchain. Verifiable cre- dentials offer a way to digitally represent and share real information about a subject in the digital world. The Kilt protocol is a blockchain technology that realizes decentralized identities and verifiable credentials. In this thesis, we have analyzed the history and current state of online identities and the most well-known providers, described the standards of decentralized identities and verifiable credentials in detail, and the Kilt pro- tocol. We have implemented a solution in line with the ten principles of self-sovereign identity, based on the Kilt protocol implementation, and cre- ated an application analogous to OAuth 2.0.20232024-03-18 09:40:13Magistrsko delo/naloga155048VisID: 35454COBISS_ID: 192117251sl