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Distributed Hash Tables (DHT) are a common architecture for decentralizedapplications and, therefore, would be suited for privacy-aware applications.However, currently existing DHTs allow every peer to access any index. To buildprivacy-aware applications, we need to control this access. In this paper, wepresent k-rAC, a privacy-aware fine-grained AC for DHTs. For authentication, wepresent three different mechanisms based on public-key cryptography,zero-knowledge-proofs, and cryptographic hashes. For authorization, we usedistributed AC lists. The security of our approach is based on k-resilience. Weshow that our approach introduces an acceptable overhead and discuss itssuitability for different scenarios.

k-rAC - a Fine-Grained k-Resilient Access Control Scheme for Distributed Hash Tables