Adapting the TPL Trust Policy Language for a Self-Sovereign Identity World

Lukas Alber, Stefan More, Sebastian Mödersheim, Anders Schlichtkrull

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

4 Citations (Scopus)

Abstract

Trust policies enable the automated processing of trust decisions for electronic transactions. We consider the Trust Policy Language TPL of the LIGHTest project [Mö19] that was designed for businesses and organizations to formulate their trust policies. Using TPL, organizations can decide if and how they want to rely on existing trust schemes like Europe’s eIDAS or trust scheme translations endorsed by them. While the LIGHTest project is geared towards classical approaches like PKI-based trust infrastructures and X.509 certificates, novel concepts are on the rise: one example is the self-sovereign identity (SSI) model that enables users better control of their credentials, offers more privacy, and supports decentralized solutions. Since SSI is based on distributed ledger (DL) technology, it is a question of how TPL can be adapted so that organizations can continue to enjoy the benefits of flexible policy descriptions with automated evaluation at a very high level of reliability. Our contribution is a first step towards integrating SSI and the interaction with a DL into a Trust Policy Language. We discuss this on a more conceptual level and also show required TPL modifications. We demonstrate that we can integrate SSI concepts into TPL without changing the syntax and semantics of TPL itself and have to add new formats and introduce a new built-in predicate for interacting with the DL. Another advantage of this is that the “business logic” aspect of a policy does not need to change, enable re-use of existing policies with the new trust model.
Original languageEnglish
Title of host publicationOpen Identity Summit 2021
EditorsHeiko Roßnagel, Christian H. Schunck, Sebastian Mödersheim
PublisherGesellschaft für Informatik e. V.
Publication date2021
Pages107-118
ISBN (Electronic)978-3-88579-706-7
Publication statusPublished - 2021
EventOpen Identity Summit 2021: Research, Experience and Innovation - DTU Compute in Lyngby, Copenhagen, Denmark
Duration: 1 Jun 20212 Jun 2021
https://oid2021.compute.dtu.dk/

Conference

ConferenceOpen Identity Summit 2021
LocationDTU Compute in Lyngby
Country/TerritoryDenmark
CityCopenhagen
Period01/06/202102/06/2021
Internet address
SeriesLecture Notes in Informatics
Volume312
ISSN1617-5468

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