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In this paper we present ZKlaims: a system that allows users to presentattribute-based credentials in a privacy-preserving way. We achieve azero-knowledge property on the basis of Succinct Non-interactive Arguments ofKnowledge (SNARKs). ZKlaims allow users to prove statements on credentialsissued by trusted third parties. The credential contents are never revealed tothe verifier as part of the proving process. Further, ZKlaims can be presentednon-interactively, mitigating the need for interactive proofs between the userand the verifier. This allows ZKlaims to be exchanged via fully decentralizedservices and storages such as traditional peer-to-peer networks based ondistributed hash tables (DHTs) or even blockchains. To show this, we include aperformance evaluation of ZKlaims and show how it can be integrated indecentralized identity provider services.

ZKlaims: Privacy-preserving Attribute-based Credentials using Non-interactive Zero-knowledge Techniques