naa a22 4500 510723926 CHVBK 20180411082928.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1007/s13347-013-0128-5 doi (NATIONALLICENCE)springer-10.1007/s13347-013-0128-5 Christianson Bruce Science and Technology Research Institute, University of Hertfordshire, College Lane, AL10 9AB, Hatfield, England, UK aut Living in an Impossible World: Real-izing the Consequences of Intransitive Trust [Elektronische Daten] [Bruce Christianson] Many accounts of online trust are based upon mechanisms for building reputation. Trust is portrayed as desirable, and handing off trust is easier if trust is modelled to be transitive. But in the analysis of cyber-security protocols, trust is usually used as a substitute for certain knowledge: it follows that if there is no residual risk, then there is no need for trust. On this grimmer understanding, the less that users are required to trust, the better. Involuntary transitivity of trust becomes corrosive, because it prevents participants from having control—or even knowledge—of the risks to which their trust assumptions expose them. In this paper, we take the stance that controlling the transitivity of trust requires us to recognise trust as a non-referentially transparent modality, similar to but significantly weaker than the epistemic modalities, and to accept the corollary that imaginary (indeed—even impossible) threats can have real consequences that adversely affect online security. An apparently paradoxical outcome is that the desire of principals to keep their trust assumptions private can actually assist the design of systems to satisfy multiple security agendas. However, this approach requires agents to have the capability to predicate accurately about states of affairs that are logically inconsistent with their beliefs, and consequently, designing systems in this way becomes more akin to diplomacy than engineering. The Author(s), 2013 Counterfactual reasoning nationallicence Doxastic logic nationallicence Intensional properties nationallicence Privacy nationallicence Security nationallicence Trust nationallicence Philosophy & Technology Springer Netherlands 26/4(2013-12-01), 411-429 2210-5433 26:4<411 2013 26 13347 https://doi.org/10.1007/s13347-013-0128-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s13347-013-0128-5 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Christianson Bruce Science and Technology Research Institute, University of Hertfordshire, College Lane, AL10 9AB, Hatfield, England, UK aut NATIONALLICENCE 773 0- Philosophy & Technology Springer Netherlands 26/4(2013-12-01), 411-429 2210-5433 26:4<411 2013 26 13347 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer