TPL: A Trust Policy Language

Sebastian Mödersheim, Anders Schlichtkrull, Georg Wagner, Stefan More, Lukas Alber

Research output: Chapter in Book/Report/Conference proceedingConference paperpeer-review


We present TPL, a Trust Policy Language and Trust Management System. It is built around the qualities of modularity, declarativity, expressive power, formal precision, and accountability. The modularity means that TPL is built in a way that makes it easily adaptable to different types of transactions and signatures. From the aspect of declarativity and expressive power, the language is built such that policies are always formulated in a positive form and the language is Turing complete. The formal precision and accountability of the language eliminates ambiguity and allows us to achieve verified evaluations. The idea is that for any decision, the system can generate a proof that can then be checked by a prover that is formally verified, in Isabelle/HOL, to be sound with respect to a first-order logic semantics.
Original languageEnglish
Title of host publicationTrust Management XIII
Subtitle of host publication13th IFIP WG 11.11 International Conference, IFIPTM 2019
Place of PublicationCopenhagen, Denmark
VolumeTrust Management XIII
ISBN (Electronic)978-3-030-33716-2
ISBN (Print)978-3-030-33715-5
Publication statusPublished - 19 Jul 2019
EventIFIPTM 2019: The 13th IFIP International Conference on Trust Management - Technical University of Denmark (DTU), Copenhagen, Denmark
Duration: 17 Jul 201919 Jul 2019


ConferenceIFIPTM 2019
Abbreviated titleIFIPTM 2019
Internet address


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