Digital identity is becoming one of the core elements during the digitalization age, when more and more processes and interactions are taking place in the digital sphere. Therefore, current identity management approaches will define how these interactions will look in the future, but different fields and communities often approach management with their own solutions and tools, despite their similarities. This includes decentralized digital identities, where the identity is managed with asymmetric cryptographic keys, and no centralized entity oversees the whole identity system. This paper focuses on managing on- and off-chain decentralized digital identities, with the former being used for blockchain networks and the latter for self-sovereignty and privacy. While both types of decentralized identity build on the same cryptographic and identity primitives, there is no single wallet that handles both. Therefore, this paper proposes an orchestration solution for both wallet types, which enables their convergence to a single universal wallet and validates it with a real-life decentralized identity use case.

Self-sovereign identity (SSI) is a user-centric, decentralised identity approach that provides a means for identification, authentication, and authorisation without the involvement of external entities, responsible for identity provisioning and management in current centralised and federated approaches. In general, the basic building blocks of an SSI system include decentralised identifiers, verifiable credentials, identity wallets, a verifiable data registry, and three main actors: issuer, identity holder, and verifier. Even though the SSI field is dominated by proposals, SSI systems can be implemented in different ways, which is reflected in the absence of a well-defined architecture. Thus, the best implementation is still a matter of research, the requirements of the individual system, and its field of application. However, well-designed and implemented systems are crucial to avoiding failures, speeding up the development process, ensuring high quality, and the broader adoption of SSI solutions. Hence, the main objective of this study was to identify design patterns and good practices of the SSI ecosystems by reviewing and analysing the literature, technical documentation, and existing SSI implementations. Therefore, the study is built on existing knowledge, and presents a comprehensive catalogue of thirty-five SSI design patterns that can serve as a starting point for a possible SSI system design.

V zborniku šestindvajsete konference OTS 2023 so objavljeni prispevki strokovnjakov s področja informatike, v katerih so predstavljena nova spoznanja in trendi razvoja, vpeljave, prilagajanja ter upravljanja informacijskih rešitev, kot tudi konkretni uspešni pristopi in dobre prakse. Prispevki naslavljajo področja sodobnih arhitekturnih izzivov, klasične, generativne in globoke umetne inteligence, sodobnih spletnih ali mobilnih uporabniških vmesnikov, kot tudi tradicionalnih, brezstrežniških in decentraliziranih zalednih sistemov v oblaku. Tematike prispevkov obsegajo tudi zagotavljanje ustreznega skalabilnega okolja zanje ter avtomatizacijo testiranja, merjenje kakovosti in dostavo s proaktivnim naslavljanjem najpogostejših kibernetskih napadov. Rdečo nit prispevkov predstavljajo podatkovne tehnologije, ki so zastopane v obliki klasičnih podatkovnih baz, podatkovnih jezer ter učinkovitega zbiranja, obdelave in vizualizacije velepodatkov. Prispevki tako še naprej omogočajo boljšo povezanost IT strokovnjakov, informatikov, arhitektov in razvijalcev naprednih IT rešitev in storitev, kot tudi akademske sfere in gospodarstva.

Artificial intelligence is transforming our lives, and technological progress and transfer from the academic and theoretical sphere to the real world are accelerating yearly. But during that progress and transition, several open problems and questions need to be addressed for the field to develop ethically, such as digital privacy, ownership, and control. These are some of the reasons why the currently most popular approaches of artificial intelligence, i.e., centralized AI (CEAI), are questionable, with other directions also being widely explored, such as decentralized artificial intelligence (DEAI), to solve some of the most reaching problems. This paper provides a systematic literature review (SLR) of existing work in the field of DEAI, presenting the findings of 71 identified studies. The paper's primary focus is identifying the building blocks of DEAI solutions and networks, tackling the DEAI analysis from a bottom-up approach. In the end, future directions of research and open problems are proposed.