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

## TL;DR

ZKlaims introduces a privacy-preserving, non-interactive credential system using SNARKs, enabling users to prove credential statements without revealing contents, suitable for decentralized networks and blockchain integration.

## Contribution

The paper presents ZKlaims, a novel system combining zero-knowledge proofs with attribute-based credentials for decentralized, privacy-preserving identity verification.

## Key findings

- Efficient zero-knowledge proof implementation for credentials
- Compatibility with decentralized storage and blockchain platforms
- Performance evaluation demonstrating practicality

## Abstract

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