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Lack of standardization and the subsequent difficulty of integration has been one of the main reasons for the scarce adoption of privacy-preserving Attribute-Based Credentials (p-ABC). Integration with the W3C's Verifiable Credentials (VC) specification would help by encouraging homogenization between different p-ABC schemes and bringing them all closer to other digital credentials. What is more, p-ABCs can help to solve privacy issues that have been identified in applications of VCs to use cases like vaccination passports. However, there has not been much work focusing on the collaboration between p-ABCs and VCs. We address this topic by establishing initial steps for extra standardization of elements that will help with the integration of p-ABCs into the standard. Namely, we propose a data model for predicates, which are a staple of p-ABC systems, and tools and guidelines to ease the adaptation process like a validation meta-schema. These ideas have been applied in a proof-of-concept implementation of the OLYMPUS distributed p-ABC scheme paired with serialization following the VC data model.

The OLYMPUS EU project is addressing the challenges associated to the use of privacy-preserving identity management solutions by establishing an inter-operable European identity management framework, based on novel cryptographic approaches applied to currently deployed identity management technologies. In particular, OLYMPUS employs distributed cryptographic techniques to split up the role of the online IDP over multiple authorities, so that no single authority can impersonate or track its users. This paper describes the IdM ecosystem being developed in the scope of OLYMPUS, including its main building blocks, requirements and use cases.