TY - CHAP A1 - Levina, Olga T1 - Operationalizing Ethics for Information Systems Design - A Tool for Ethical Software T2 - Konferenz: Twenty-ninth Americas Conference on Information Systems (AMCIS), Panama, 2023 N2 - Propagation of information technology in the increasingly diverse domains, raises question concerning moral implications. While the number of ethical principles in the IT design is growing, they do not necessarily apply to specific products, which means developers and e.g. purchasing agent need to contextualize them for each specific IT product. This paper describes an actionable artifact that allows assessment of ethical non-functional requirements of an information system through operationalization of ethical values, Ethical Software Assessment Tool (ESAT). It is based on a survey of values that are currently considered in research and practice as well as in legal initiatives in IT context. The ethical approach and principles operationalized in ESAT are presented and discussed. Y1 - 2023 UR - https://aisel.aisnet.org/amcis2023/sig_phil/sig_phil/5 ER - TY - CHAP A1 - Frosch, Katharina T1 - Scan to Learn: A Lightweight Approach for Informal Mobile Micro-Learning at the Workplace T2 - Konferenz: IARIA The Fifteenth International Conference on Mobile, Hybrid, and On-line Learning; Venice (Italy) N2 - Informal learning at the workplace is a crucial ingredient in updating and upskilling today's workforce, but in many jobs, informal learning opportunities are scarce. Bite-sized learning via mobile devices (Mobile Micro-Learning, MML) can be a powerful means to enhance informal work-related learning also in such learning-deprived fields. Based on good practices of recent MML implementations, a lightweight approach is developed. It involves an instructional blueprint and an open-source, low-threshold technology for MML, and meets the specific needs of workers in learning-deprived fields. The main idea is a scan-to-learn system where Quick Response (QR) codes are attached to physical objects in the work environment. Workers can scan the QR codes to learn and are directed to short, interactive learning nuggets. For evaluation, a proof-of-concept is provided. Y1 - 2023 SN - 978-1-68558-081-0 SP - 53 EP - 61 PB - IARIA ER - TY - CHAP A1 - Fitz, Lukas R. G. A1 - Veldyaeva, Ekaterina A1 - Teutenberg, Lukas A1 - Scheeg, Michaela A1 - Scheeg, Jochen T1 - Puzzle away the Puzzledness: Action-Design Study of an Educational Escape Room for Intervention in SMEs’ Perception towards ICT Adoption T2 - Konferenz: 57th Hawaii International Conference on System Sciences (HICSS); Honolulu, HI, USA N2 - Digital transformation initiatives in small and medium-sized enterprises (SME) are often hampered by individual practitioners' perceptions of information and communication technology (ICT). This research employs an educational escape room (ER) game for an intervention towards informed decision-making on ICT adoption in SMEs. ER design and implementation are elaborated and consequently tested with SME practitioners, all embedded in an action-design study based on a qualitative research methodology. The result highlights a trade-off between creating immersive game experiences and achieving learning objectives. Still, the outcome implies an impact on players' perception of ICT integrated in the ER. The findings contribute to the emerging field of serious games for learning and shed light on the potential of game-based interventions for SMEs. Y1 - 2023 UR - https://hdl.handle.net/10125/107027 SN - 978-0-9981331-7-1 U6 - https://doi.org/10.24251/HICSS.2024.642 SP - 5347 EP - 5356 ER - TY - CHAP A1 - Fitz, Lukas R. G. A1 - Scheeg, Jochen T1 - What is Digital about Digital Innovation? An Ontological Discussion of Digitality T2 - Konferenz: 29th Americas Conference on Information Systems N2 - "Digital" is a popular adjective for concepts related to electronic, computerized or networked processes in current research and practice. From an ontological-theoretical perspective, the prevalence of digital things triggers the question, how Digitality itself could be conceptualized. This article studies the ontology of Digitality and consequently discusses Digital Innovation (DI) from a new perspective. First, literature on Digitality is analyzed. Based on the findings, an ontological conceptual framework of Digitality (OCFD) is proposed. It describes four layers of Digitality: physical foundations, virtuality, digital culture and world, and digital metaphysics. From a human perspective, requirements to grasp and embody Digitality are highlighted, as well as the expansion of reality. Finally, Digitality is discussed as a paradigm of DI and exemplary digital phenomena are projected onto the OCFD. This paper contributes to DI research and practice through theory-building towards a better understanding of ontological characteristics and practical implications of Digitality in DI. Y1 - 2023 PB - Panama City, Panama ER - TY - CHAP A1 - Veldyaeva, Ekaterina A1 - Fitz, Lukas R. G. A1 - Scheeg, Jochen T1 - Developing Digital Competencies in Small and Medium-Sized Enterprises Through Microlearning Applications: A Research Agenda T2 - Konferenz: Perspectives in Business Informatics Research 22nd International Conference on Business Informatics Research, BIR 2023, Ascoli Piceno, Italy, September 13–15, 2023, Proceedings N2 - This article presents a research outline on the use of microlearning applications to develop digital competencies in Small and Medium-sized Enter-prises (SMEs). The digital transformation of businesses has become essential for their survival, and SMEs need to develop digital competencies (DC) to remain competitive in the market. Microlearning (ML), a form of learning that involves small, bite-sized learning modules, has been gaining popularity in recent years as a way to efficiently and effectively develop skills. Through a semi-systematic literature review approach, our study examines prevalent knowledge in the area of ML and DC and discusses interrelations. As a result, we propose a research roadmap consisting of six research questions targeting four dimensions of ML for DC development in SMEs: 1) context, 2) formats, 3) reward system, and 4) complexity level. Y1 - 2023 U6 - https://doi.org/10.1007/978-3-031-43126-5_7 SP - 41 EP - 58 ER - TY - CHAP A1 - Richter, Nancy A1 - Wrobel, Martin T1 - The Impact of prototyping on the survival chances of digital early-stage startups: Findings and insights from explorative expert interviews T2 - Proceedings of the 18th European Conference on Innovation and Entrepreneurship, ECIE 2023 N2 - The products of digital entrepreneurs are highly innovative, and their business models contribute to the prosperity and further development of the economy and society. However, studies indicate that most of all startups fail, particularly during the early stages of their business journey Prototyping as part of Lean Startup or Business Model Testing approaches, can assist digital early-stage startups in navigating uncertainty and achieving successful product launches. However, these methods are applied very individually and there is little empirical research on best practices. We therefore conducted 65 explorative expert interviews and asked successful startups about their prototyping practices. Our results include learnings on the prototyping process and the testing format, the role of the founding team during prototyping practices, the customer focus and the role of networks. Our study adds important details to theory and practice of the innovation and prototyping processes of digital early-stage startups. Our results offer actionable advice and guidance to any current and potential entrepreneur, but especially to first-time founders and less experienced executives in early stage-startups. Additionally, our contribution enhances the theoretical understanding of the Lean Startup approach and prototyping practices. Y1 - 2023 U6 - https://doi.org/10.34190/ecie.18.2.1714 VL - 18 IS - 2 SP - 772 EP - 779 PB - Academic Conferences International Limited ER - TY - CHAP A1 - Frosch, Katharina A1 - Lindauer, Friederike A1 - Zuidhof, Niek T1 - Exploring the Digital Divide in Workplace Learning: A Rapid Review T2 - ICDS 2024, The Eighteenth International Conference on Digital Society, Barcelona, Spain N2 - This article examines the digital learning divide in workplace learning, with an emphasis on the disparity in the distribution of advanced learning technologies (ALT) across different types of workplaces. The study employs a rapid literature review methodology to analyze the utilization of ALT in workplace learning. The findings indicate that the use of ALT is predominantly concentrated in the education, health and medical sectors, with limited implementation in other sectors. Moreover, in smaller organizations, in non-technical sectors and among white-collar workers, there are fewer opportunities for technology-enhanced learning. The study highlights the need for more inclusive and comprehensive research to address the digital divide in workplace learning, taking into consideration practice-based evidence and exploring the themes covered by training. Furthermore, the paper proposes an investigation into the complexity and resource intensity of implementing ALT to enhance technology-based learning in all workplaces. In general, this research establishes the basis for comprehending and bridging the digital learning divide in the workplace. Y1 - 2024 SP - 1 EP - 6 PB - IARIA ER - TY - CHAP A1 - Bollow, Maximilian A1 - Frosch, Katharina A1 - Grunz, Angelina A1 - Hädicke, Svenja A1 - Judge, Rabina A1 - Levina, Olga T1 - Using Advanced Learning Technologies to Boost Sustainability Education: The Role of AI-based Chatbots T2 - EDEN 2024 Annual Conference, University of Graz, Graz, Austria, 2024 N2 - In the face of the 2030 Agenda of the United Nations, the everchanging knowledge base of sustainability and therelated learning become vital. This applies especially to the field of sustainable digitalization. The literature providesgaps in the combination of sustainable digitalization with learning, due to the rapid developments and innovationsin this field.AI-based Chatbots could be a solution to rapidly build knowledge in this fast-evolving field, as they are able to drawupon a large body of recent knowledge and allow personalized, individual learning. They are created to understandquestions and respond to users via text, voice, or avatar in an interactive manner to facilitate learning (AI-Abdullatif,2023). Thus, AI-based Chatbots could enhance student-centered e-learning, which has shown to be a valuable toolfor sustainability literacy (Diamond & Irwin, 2013). Nonetheless, existing research does not yet provide sufficientevidence on what learning outcomes (e.g., knowledge acquisition) can be achieved with this AI-based approach tolearning. Therefore, it is crucial for us to determine whether and how they can be effectively utilized for this purpose.In this study, we examine the impact of AI-based Chatbots on learning outcomes in the context of sustainabledigitalization, in comparison to conventional digital learning methods. We conduct a field experiment with a pre-and post-test assessing the respective level of knowledge and sustainability-related competencies amongparticipants. The participants of the study (N=269) engage with different types of supported learning activitiesrelated to sustainable development. Participants are randomly assigned to one of four advanced learningtechnologies: a) AI-assisted personal tutoring (Chatbot), b) non-AI-based conversational learning and c) interactivevideo with embedded activities. Variations in learning outcomes depending on design characteristics of the learningactivity will be measured using the Self-Perceived Action Competence for Sustainability Questionnaire (SPACS-Q)(Olsson et al., 2020) as well as as well as a set of questions to assess knowledge retention.Results indicate that AI-based chatbots may be a viable method to enhance knowledge about practices in sustainabledigitalization. However, sustainability action competencies, such as confidence in one's own influence on shaping amore sustainable future and the willingness to undertake concrete actions, which may require higher-order learningprocesses, are not positively affected by short learning activities with our AI-based chatbot. We found evidence thatnon-AI-based learning activities yield similar increases in building knowledge on sustainable digitalization but alsosignificantly enhance sustainability action competencies related to potential behavioral changes.What does learner-centered pedagogy look like in reimagining the digital classroom of the future?93Assuming that our results are generalizable to other learning topics, the evidence found in this study suggests thatAI-based chatbots can contribute to addressing our most significant transformational challenges, all characterizedby a rapidly evolving knowledge base. Further research is particularly needed with respect to the preferable designcharacteristics of digital learning activities (both AI-based and non-AI-based) to achieve optimal outcomes in buildingsustainability competencies. Y1 - 2024 UR - https://repositorio-aberto.up.pt/bitstream/10216/159440/2/678463.pdf#page=104 SP - 92 EP - 93 ER - TY - CHAP A1 - Nitze, André A1 - Wang, Tingting A1 - Jahn, Josephine A1 - Ali, Sabah T1 - Beyond Connectivity: A Sustainable Approach to Municipal LoRaWAN Infrastructure and Services T2 - Konferenz: ICDS 2024 : The Eighteenth International Conference on Digital Society; Barcelona, Spain N2 - This paper introduces the LoRaWAN Collaboration Framework (LCF), a strategic blueprint for deploying and managing LoRaWAN infrastructures in smart cities with an emphasis on rural and small municipalities. LoRaWAN technology is distinguished by its capability to support long-range, low-power IoT applications, making it ideal for extensive and sparsely populated areas. The LCF aims to address common challenges in these settings, such as limited technical expertise, financial constraints, and the need for cross-municipal cooperation. It outlines roles and responsibilities across various stakeholders including municipal authorities, IT service providers, application developers, and end-users. The framework emphasizes the balance of technological, economic, ecological, and social sustainability in line with the United Nations' Sustainable Development Goals. In this paper we describe the experiences from several LoRaWAN projects in small towns and municipalities, the derived framework, and future research directions towards ensuring the economic viability of the proposed model. Y1 - 2024 SP - 19 EP - 24 PB - IARIA ER - TY - CHAP A1 - Wang, Tingting A1 - Nitze, André A1 - Hofstedt, Petra A1 - Löffler, Sven A1 - Hennig, Silvia A1 - Klinge, Alexander T1 - Technische Machbarkeit von ländlichem On-Demand-Verkehr: Anforderungen an eine Open-Source-Software-Architektur T2 - 24. Nachwuchswissenschaftler:innenkonferenz N2 - On-Demand-Verkehr bezeichnet Mobilitätsangebote, die auf Bestellung verfügbar sind. Ziel ist es, durch flexible Mobilitätsangebote Lücken im ländlichen öffentlichen Personennahverkehr (ÖPNV) zu schließen, insbesondere in dünn besiedelten Räumen und zu Randzeiten des Tages. Die Einführung solcher Dienste gestaltet sich für viele Kommunen jedoch aufgrund der hohen Lizenzgebühren für proprietäre Software als äußerst schwierig, insbesondere in strukturschwachen Regionen, die solche Dienste besonders benötigen. Im Rahmen des Projekts "Open-Source-Software für ländlichen On-Demand-Verkehr" (OSLO) wurde die Umsetzbarkeit einer niedrigschwelligen Open-Source-Lösung geprüft. Diese Lösung soll langfristig in die Open-Source-Mobilitätsplattform bbnavi integriert werden, um die Nutzung vorhandener Mobilitätsdaten zu erleichtern, Interoperabilität zu gewährleisten und die Anpassung an andere Regionen zu vereinfachen. Das Konzept beinhaltet eine Software-Architektur, einen speziell für den ländlichen Nahverkehr entwickelten intermodalen Routing-Algorithmus und ein Betriebs- und Organisationsmodell ([1]). In diesem Beitrag wird beschrieben, wie eine effiziente Software-Architektur für das OSLO-Projekt entworfen wurde. Die zentralen Themen beinhalten die Strukturierung der Komponenten, die Anwendung von GTFS-Flex-V2, die Integration des angepassten Routing-Algorithmus sowie die Einbindung externer Schnittstellen. KW - On-Demand-Verkehr KW - Software-Architektur KW - Open Source Y1 - 2024 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bsz:mit1-opus4-154308 SN - 1437-7624 IS - 3 SP - 361 EP - 366 PB - Hochschule Mittweida CY - Mittweida ER - TY - CHAP A1 - Levina, Olga T1 - Incorporating Ethical Aspects in Information Systems Requirements Engineering T2 - Perspectives in Business Informatics Research, 23rd International Conference on Business Informatics Research, BIR 2024, Prag, Tschechien, September 11–13, 2024 N2 - Ethical considerations in software requirements engineering are a critical but often overlooked aspect of the software development process. However, requests for transparency and autonomy in the way IT artefacts are designed, described, used, applied and integrated in the everyday life are getting more pressing within the society. In this research, the process of software engineering is taken as an illustrative model for the proactive incorporation of ethical principles in the system design within the design of a software artefact. Specifically, the phase of requirements elicitation and analysis are expanded with ethical aspects, since that is where the first steps of the software construction as an artefact are initiated and the first common ground of understanding is achieved. Being rooted in the security engineering, the SQUARE process is expanded to provide a basic structure for incorporating of ethical aspects into software design. By doing so, the social and moral values become central to the design and development of new technologies. Y1 - 2024 UR - https://link.springer.com/content/pdf/10.1007/978-3-031-71333-0.pdf U6 - https://doi.org/10.1007/978-3-031-71333-0_10 SP - 153 EP - 161 PB - Springer ER - TY - CHAP A1 - Fitz, Lukas R. G. A1 - Scheeg, Jochen T1 - Content-And-Review Platform Engagement of End-Users and Local Businesses – An Explorative Analysis Based on Google Maps Data T2 - Digital Economy. Emerging Technologies and Business Innovation. ICDEc 2024. Lecture Notes in Business Information Processing N2 - One fundamental value proposition of every digital platform is to facilitate transactions between two or more stakeholders. Active user engagement is therefore a crucial success factor for platforms to thrive, grow and establish a competitive network. This paper delves into the topic of platform engagement on content-and-review platforms by using Google Maps as a research tool. Applying a qualitative approach, a descriptive analysis of local business entities’ data on Google Maps is elaborated, focusing particularly on engagement activi-ties in the conjunction of business-owners and end-users. The findings suggest that under-, over-, and non-engagement are less desirable for local business entities. Following a practice-oriented discussion, strategic pathways are proposed to leverage business value from platform engagement activities. Y1 - 2024 U6 - https://doi.org/10.1007/978-3-031-76365-6_12 VL - 530 SP - 179 EP - 192 PB - Springer ER - TY - CHAP A1 - Fitz, Lukas R. G. A1 - Scheeg, Michaela A1 - Scheeg, Jochen T1 - Information, Inspiration, Innovation - Designing an Open Innovation Platform for SME Digital Transformation Projects T2 - CENTERIS – International Conference on ENTERprise Information Systems / ProjMAN – International Conference on Project MANagement / HCist – International Conference on Health and Social Care Information Systems and Technologies 2023 N2 - When small- and medium-sized Enterprises (SMEs) pursue digital transformation (DT) projects, awareness for available solutions and exploration of best practices and collaboration opportunities belong to key activities. This short paper presents background, design and preliminary evaluation of an open innovation (OI) platform for SME DT, which showcases projects completed by collaborating expert institutions and offers new project pitches. Initial findings from user tests with SME practitioners indicate that the solution supports SMEs in DT exploration phases. Moreover, insights on SME OI platform design criteria are derived. Y1 - 2024 U6 - https://doi.org/10.1016/j.procs.2024.06.276 SP - 11009 EP - 11114 PB - Elsevier ER - TY - CHAP A1 - Veldyaeva, Ekaterina A1 - Fitz, Lukas R. G. A1 - Scheeg, Jochen T1 - Gamifying IT Service Management Education for Future IT Professionals T2 - Pacific Asia Conference on Information Systems, Ho Chi Minh City, Vietnam, 2024 N2 - IT Service Management (ITSM) education is nowadays an established subject of IT-related higher education programs worldwide. The recent years have witnessed significant developments in software and ITSM frameworks, which underscores the importance of adapting educational formats to meet the latest standards. Recent developments include the introduction of practice-oriented approaches and case-based learning. Building upon previous literature, this study describes and evaluates the first iteration of a teaching case integrating a simulation game for practicing ITIL® 4 foundations in an undergraduate ITSM curriculum. The game-based approach shows scalability and dynamism, fostering high student engagement and content comprehension. It represents a promising avenue for training IT workers and contributes to ongoing ITSM education development. Y1 - 2024 UR - https://aisel.aisnet.org/cgi/viewcontent.cgi?article=1066&context=pacis2024 SP - 1 EP - 9 ER - TY - CHAP A1 - Blasek, Katrin ED - Bernzen, Anna ED - Fritzsche, Jörg ED - Heinze, Christian ED - Thomsen, Oliver T1 - Datenschutzrechtliche Aspekte der geplanten EU-ID-Wallet T2 - Das IT-Recht vor der (europäischen) Zeitenwende? : Tagungsband Herbstakademie 2023 Y1 - 2024 SN - 978-3-95599-077-0 VL - 2023 SP - 73 EP - 90 PB - OlWIR Verlag für Wirtschaft, Informatik und Recht ER - TY - CHAP A1 - Craig, Kevin A1 - Fitz, Lukas R. G. A1 - Miller, Kasey T1 - IT Identity fostering User Innovation on Digital Platforms: The Role of Self-Esteem T2 - AMCIS 2025, 31st Americas Conference on Information Systems, Montréal, Canada, 2025 N2 - Digital platforms can grow by motivating users to explore new ways to use a wider range of affiliated products and services. This work explores the power of IT Identity to motivate such innovative use, through identity's ability to intrinsically motivate behavior. Data from 209 Amazon.com users indicates that IT Identity may cause Trying to Innovate with an IT, mediated by Self-Esteem. Y1 - 2025 UR - https://aisel.aisnet.org/cgi/viewcontent.cgi?article=1114&context=amcis2025 SP - 1 EP - 9 PB - Association for Information Systems ER - TY - CHAP A1 - Fitz, Lukas R. G. A1 - Veldyaeva, Ekaterina A1 - Kunze, Adrian A1 - Scheeg, Michaela A1 - Scheeg, Jochen T1 - aiSnoop: An AI-assisted Social Listening Tool for SME Managers T2 - 31st Americas Conference on Information Systems, AMCIS 2025, Montréal, Canada, 2025 N2 - With growing popularity of social networks and online brand engagement, small and medium-sized enterprises (SME) are facing challenges in leveraging business value effectively from interactions with their online communities. Social listening tools, enhanced by artificial intelligence (AI), help enterprises to better understand customer needs and trends by synthesizing engagement and interaction data from various channels into actionable insights. However, prevalent tools widely appear too costly, inaccessible and complex to handle for SME managers. In response, we present this article on the design of "aiSnoop", an AI-assisted social listening tool for SME managers. The article describes how the tool was developed, demonstrated and evaluated as a design artifact with an SME-contextualized design science research approach. We find that automation, usability and transparency, and advanced AI integration are important social listening tool capabilities for SMEs, contributing to the broader discussion on AI-assisted decision-support system design from an SME-and practice-oriented research perspective. Y1 - 2025 UR - https://aisel.aisnet.org/cgi/viewcontent.cgi?article=1231&context=amcis2025 SP - 1 EP - 11 PB - Association for Information Systems ER - TY - CHAP A1 - Teutenberg, Lukas A1 - Fitz, Lukas R. G. A1 - Scheeg, Jochen T1 - Current Design Practices in Applied Augmented Reality Research: A Methodological Review T2 - Computer-Human Interaction Research and Applications. CHIRA, 2024 N2 - Successful Augmented Reality (AR) solutions require high technology acceptance and desire among users. Applying appropriate design methodologies can enhance the development of desirable AR systems and help to streamline design research projects. This article presents a methodological literature review of 58 pertinent articles, exploring the representation of methodological design frameworks in currently applied AR research practice. In result, User-Centered Design was identified most frequently by a large margin. Though, it could be observed that most articles from the field of applied AR only marginally describe any design processes. Moreover, Human-Centered Design, Participatory Design and Value Sensitive Design were only scantily represented; less than half of the papers followed a Design Science Research or Action Design Research approach. Several implications for applied research and practice are derived from these findings and discussed together with future research opportunities. Overall, this study contributes to the refinement of methodological design practice in the field of applied AR research. Y1 - 2025 UR - https://www.insticc.org/node/TechnicalProgram/chira/2024/presentationDetails/129048 U6 - https://doi.org/10.1007/978-3-031-82633-7_9 SP - 131 EP - 146 PB - Springer ER - TY - CHAP A1 - Veldyaeva, Ekaterina A1 - Fitz, Lukas R. G. A1 - Scheeg, Michaela A1 - Scheeg, Jochen T1 - Unlocking AI for SMEs: How an Educational Escape Room Shapes Perceptions towards Technology Adoption Decision-Making T2 - Proceedings of the 58th Hawaii International Conference on System Sciences, Waikoloa, HI, USA, 2025 N2 - Facing modern challenges of digital transformation, small and medium-sized enterprises (SMEs) need to ensure informed and strategic decision-making before adopting new digital technology. This study builds upon Action Design Research (ADR) on educational escape room design targeting SME practitioners in technology adoption decision-making. We hypothesize that the game experience influences SMEs’ artificial intelligence (AI) adoption decisions regarding technology-, organization- and environment-related perceptions and evaluate the survey data of 70 participants, who are SME owners or members. According to the results, the game-based approach was well-received. Engagement in the game positively influenced participants' affective state and improved self-reflection. The experience influenced participants' perceptions of AI's transformative potential. In order to facilitate easier transfer to different personal business contexts, future design iterations will include more process-neutral AI applications. The study contributes to research on game-based knowledge transfer in organizational contexts, providing insightful results and encouraging further exploration in this emerging field. Y1 - 2025 UR - https://hdl.handle.net/10125/109437 SP - 4905 EP - 4914 ER - TY - CHAP A1 - Helmich, Roland A1 - Braubach, Lars A1 - Schulz, Theresa A1 - Jander, Kai T1 - Securing End-to-End Encrypted File Sharing Services with the Messaging Layer Security Protocol T2 - Intelligent Distributed Computing XVII, 2024 N2 - To protect data on the servers of cloud service providers, file-sharing services rely on End-to-End Encryption (E2EE). However, existing solutions have weaknesses that allow attackers to bypass E2EE permanently after stealing a clients keys once. In this paper, a concept for an E2EE file-sharing service is proposed which does not have this vulnerability. It is based on Messaging Layer Security (MLS) groups for key distribution, an authentication system based on asymmetric cryptography, Attribute-Based Access Control (ABAC) based access rights and a tamper-proof versioned storage system for synchronising sensitive data. The applicability of the concept is demonstrated by a prototype implementation and an evaluation based on benchmarks and a security analysis. Overall, the concept can fulfil the requirements of a basic file sharing service while providing stronger security guarantees than existing solutions. Y1 - 2025 UR - https://link.springer.com/chapter/10.1007/978-3-031-87639-4_7 U6 - https://doi.org/10.1007/978-3-031-87639-4_7 IS - 1203 SP - 107 EP - 122 PB - Springer ER -