@phdthesis{Gruener2022,
  author    = {Gr{\"u}ner, Andreas},
  title     = {Towards practical and trust-enhancing attribute aggregation for self-sovereign identity},
  doi       = {10.25932/publishup-56745},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-567450},
  school      = {Universit{\"a}t Potsdam},
  pages     = {xvii, 175},
  year      = {2022},
  abstract  = {Identity management is at the forefront of applications' security posture. It separates the unauthorised user from the legitimate individual. Identity management models have evolved from the isolated to the centralised paradigm and identity federations. Within this advancement, the identity provider emerged as a trusted third party that holds a powerful position. Allen postulated the novel self-sovereign identity paradigm to establish a new balance. Thus, extensive research is required to comprehend its virtues and limitations. Analysing the new paradigm, initially, we investigate the blockchain-based self-sovereign identity concept structurally. Moreover, we examine trust requirements in this context by reference to patterns. These shapes comprise major entities linked by a decentralised identity provider. By comparison to the traditional models, we conclude that trust in credential management and authentication is removed. Trust-enhancing attribute aggregation based on multiple attribute providers provokes a further trust shift. Subsequently, we formalise attribute assurance trust modelling by a metaframework. It encompasses the attestation and trust network as well as the trust decision process, including the trust function, as central components. A secure attribute assurance trust model depends on the security of the trust function. The trust function should consider high trust values and several attribute authorities. Furthermore, we evaluate classification, conceptual study, practical analysis and simulation as assessment strategies of trust models. For realising trust-enhancing attribute aggregation, we propose a probabilistic approach. The method exerts the principle characteristics of correctness and validity. These values are combined for one provider and subsequently for multiple issuers. We embed this trust function in a model within the self-sovereign identity ecosystem. To practically apply the trust function and solve several challenges for the service provider that arise from adopting self-sovereign identity solutions, we conceptualise and implement an identity broker. The mediator applies a component-based architecture to abstract from a single solution. Standard identity and access management protocols build the interface for applications. We can conclude that the broker's usage at the side of the service provider does not undermine self-sovereign principles, but fosters the advancement of the ecosystem. The identity broker is applied to sample web applications with distinct attribute requirements to showcase usefulness for authentication and attribute-based access control within a case study.},
  language  = {en}
}
@article{KrauseVanThiel2018,
  author    = {Krause, Tobias Alexander and Van Thiel, Sandra},
  title     = {Perceived managerial autonomy in municipally owned corporations},
  series = {Public management review},
  volume    = {21},
  journal   = {Public management review},
  number    = {2},
  publisher = {Routledge, Taylor \& Francis Group},
  address   = {Abingdon},
  issn      = {1471-9037},
  doi       = {10.1080/14719037.2018.1473472},
  pages     = {187 -- 211},
  year      = {2018},
  abstract  = {Many European municipalities rely on municipally owned corporations (MOCs) to serve the public interest. Some MOCs, e.g. utilities or hospitals, are also aimed at generating financial revenue, others provide funded services like public transportation. Our article explores local governments' approaches to the managerial control of influential MOCs. To conceptualize control, we distinguish control mechanisms (e.g. output control), correlates (e.g. policy-profession conflict), and perceived managerial autonomy. Drawing on a sample of 243 MOC top managers in Germany, structural equation modelling reveals four complex relationships between output control, process control, supervisor trust, and policy-profession conflict as antecedents of perceived managerial autonomy.},
  language  = {en}
}
@article{UrbachFay2021,
  author    = {Urbach, Tina and Fay, Doris},
  title     = {Leader member exchange in leaders' support for voice},
  series = {Applied psychology : an international review},
  volume    = {70},
  journal   = {Applied psychology : an international review},
  number    = {2},
  publisher = {Wiley},
  address   = {Hoboken},
  issn      = {0269-994X},
  doi       = {10.1111/apps.12245},
  pages     = {674 -- 708},
  year      = {2021},
  abstract  = {While previous research underscores the role of leaders in stimulating employee voice behaviour, comparatively little is known about what affects leaders' support for such constructive but potentially threatening employee behaviours. We introduce leader member exchange quality (LMX) as a central predictor of leaders' support for employees' ideas for constructive change. Apart from a general benefit of high LMX for leaders' idea support, we propose that high LMX is particularly critical to leaders' idea support if the idea voiced by an employee constitutes a power threat to the leader. We investigate leaders' attribution of prosocial and egoistic employee intentions as mediators of these effects. Hypotheses were tested in a quasi-experimental vignette study (N = 160), in which leaders evaluated a simulated employee idea, and a field study (N = 133), in which leaders evaluated an idea that had been voiced to them at work. Results show an indirect effect of LMX on leaders' idea support via attributed prosocial intentions but not via attributed egoistic intentions, and a buffering effect of high LMX on the negative effect of power threat on leaders' idea support. Results differed across studies with regard to the main effect of LMX on idea support.},
  language  = {en}
}
@misc{UrbachFay2021,
  author    = {Urbach, Tina and Fay, Doris},
  title     = {Leader member exchange in leaders' support for voice},
  series = {Zweitver{\"o}ffentlichungen der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe},
  volume    = {70},
  journal   = {Zweitver{\"o}ffentlichungen der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe},
  number    = {2},
  issn      = {1866-8364},
  doi       = {10.25932/publishup-51090},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-510904},
  pages     = {37},
  year      = {2021},
  abstract  = {While previous research underscores the role of leaders in stimulating employee voice behaviour, comparatively little is known about what affects leaders' support for such constructive but potentially threatening employee behaviours. We introduce leader member exchange quality (LMX) as a central predictor of leaders' support for employees' ideas for constructive change. Apart from a general benefit of high LMX for leaders' idea support, we propose that high LMX is particularly critical to leaders' idea support if the idea voiced by an employee constitutes a power threat to the leader. We investigate leaders' attribution of prosocial and egoistic employee intentions as mediators of these effects. Hypotheses were tested in a quasi-experimental vignette study (N = 160), in which leaders evaluated a simulated employee idea, and a field study (N = 133), in which leaders evaluated an idea that had been voiced to them at work. Results show an indirect effect of LMX on leaders' idea support via attributed prosocial intentions but not via attributed egoistic intentions, and a buffering effect of high LMX on the negative effect of power threat on leaders' idea support. Results differed across studies with regard to the main effect of LMX on idea support.},
  language  = {en}
}
@misc{Kaina2007,
  author    = {Kaina, Viktoria},
  title     = {Kollektive Identit{\"a}t und Vertrauen in Europa},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-13429},
  year      = {2007},
  abstract  = {Welche Vorraussetzungen sind n{\"o}tig, um das europ{\"a}ische Einigungsprojekt auf Dauer zu tragen? Erstens bleibt die Herausbildung einer europ{\"a}ischen kollektiven Identit{\"a}t f{\"u}r die {\"U}berlebensf{\"a}higkeit der Union unverzichtbar. Zweitens bleibt die EU auf demokratische Institutionen angewiesen. Drittens kommt dem Vertrauen der Europ{\"a}er eine zentrale Rolle im weiteren europ{\"a}ischen Integrationsprozess zu.},
  language  = {de}
}
@article{HofeditzMirbabaieOrtmann2023,
  author    = {Hofeditz, Lennart and Mirbabaie, Milad and Ortmann, Mara},
  title     = {Ethical challenges for human-agent interaction in virtual collaboration at work},
  series = {International journal of human computer interaction},
  journal   = {International journal of human computer interaction},
  publisher = {Taylor \& Francis},
  address   = {New York, NY},
  issn      = {1044-7318},
  doi       = {10.1080/10447318.2023.2279400},
  pages     = {17},
  year      = {2023},
  abstract  = {In virtual collaboration at the workplace, a growing number of teams apply supportive conversational agents (CAs). They take on different work-related tasks for teams and single users such as scheduling meetings or stimulating creativity. Previous research merely focused on these positive aspects of introducing CAs at the workplace, omitting ethical challenges faced by teams using these often artificial intelligence (AI)-enabled technologies. Thus, on the one hand, CAs can present themselves as benevolent teammates, but on the other hand, they can collect user data, reduce worker autonomy, or foster social isolation by their service. In this work, we conducted 15 expert interviews with senior researchers from the fields of ethics, collaboration, and computer science in order to derive ethical guidelines for introducing CAs in virtual team collaboration. We derived 14 guidelines and seven research questions to pave the way for future research on the dark sides of human-agent interaction in organizations.},
  language  = {en}
}
@masterthesis{Kabaali2022,
  type      = {Bachelor Thesis},
  author    = {Kabaali, Daphne},
  title     = {Die Rolle von Street-Level Bureaucrats bei der Erbringung von {\"o}ffentlichen Leistungen - eine empirische Untersuchung},
  issn      = {2190-4561},
  doi       = {10.25932/publishup-56355},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-563555},
  school      = {Universit{\"a}t Potsdam},
  pages     = {ii, 29},
  year      = {2022},
  abstract  = {Die Transformation der {\"o}ffentlichen Verantwortung im Bereich der sozialen Wohlfahrt f{\"u}hrte in den letzten Jahren zu einem gestiegenen Forschungsinteresse an Mitarbeiten-den, die sich an der Schnittstelle zwischen {\"o}ffentlicher Verwaltung und direktem Kontakt zu Klient*innen befinden. Die vorliegende Arbeit geht am Beispiel der Schulsozialarbeit an Potsdamer Grundschulen der Frage nach, inwieweit Vertrauen in Klient*innen die Nutzung von Ermessensspielr{\"a}umen durch Schulsozialarbeiter*innen beeinflusst. Das Street-Level Bureaucracy Framework nach Michael Lipsky spannt dabei den theoretischen Rahmen, w{\"a}hrend qualitative Interviews mit Schulsozialarbei-ter*innen die Basis f{\"u}r die Beantwortung der Forschungsfrage darstellen. Die Ergebnis-se zeigen, dass ein geringeres Maß an Vertrauen in Klient*innen daf{\"u}r sorgt, dass Schulsozialarbeiter*innen durch Bew{\"a}ltigungsstrategien wie der Rationierung von Res-sourcen und dem gedanklichen R{\"u}ckzug von Klient*innen versuchen, ihre Arbeitslast zu verringern. Ein h{\"o}heres Maß an Vertrauen in Klient*innen sorgt hingegen daf{\"u}r, dass sie ihre Ermessensspielr{\"a}ume zu Gunsten dieser Klient*innen nutzen, zum Beispiel durch das Umgehen von Datenschutzregeln zur effektiveren Fallbearbeitung.},
  language  = {de}
}
@inproceedings{GruenerMuehleGayvoronskayaetal.2019,
  author    = {Gr{\"u}ner, Andreas and M{\"u}hle, Alexander and Gayvoronskaya, Tatiana and Meinel, Christoph},
  title     = {A quantifiable trustmModel for Blockchain-based identity management},
  series = {IEEE 2018 International Congress on Cybermatics / 2018 IEEE Conferences on Internet of Things, Green Computing and Communications, cyber, physical and Social Computing, Smart Data, Blockchain, Computer and Information Technology},
  booktitle = {IEEE 2018 International Congress on Cybermatics / 2018 IEEE Conferences on Internet of Things, Green Computing and Communications, cyber, physical and Social Computing, Smart Data, Blockchain, Computer and Information Technology},
  publisher = {IEEE},
  address   = {New York},
  isbn      = {978-1-5386-7975-3},
  doi       = {10.1109/Cybermatics_2018.2018.00250},
  pages     = {1475 -- 1482},
  year      = {2019},
  language  = {en}
}