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Secure and Privacy-Preserving Credentials for E-ID - Final Report (Dengler, Humbert, Gasser 2026)

Last modified: 2026-10-28

DOI: 10.5281/zenodo.23694203 · URL: https://github.com/eid-privacy/zkp-reports/releases/download/latest/eid-privacy-MS4.pdf

Summary

Final (Milestone 4) report for Innosuisse grant 101.292 IP-ICT between EPFL and SICPA. Presents a simplified Spartan-based ZKP backend that proves arbitrary predicates over unmodified SD-JWT credentials as used in the Swiss e-ID (swiyu), including holder binding, with benchmarks on mobile phones (e.g. an age proof in about 4.5s on a mid-range Android phone with precomputation), a third-party security review, and integration into SICPA's Digital Trust Platform. Compares the approach with Longfellow, Crescent and OpenAC.

Related resources

• Anonymous Credentials from ECDSA (Frigo & shelat 2024) (paper, 2024)
• Crescent: Stronger Privacy for Existing Credentials (Paquin, Policharla, Zaverucha 2024) (paper, 2024)
• OpenAC: Open Design for Transparent and Lightweight Anonymous Credentials (Eagen, Ngo, Rushi, Tong, Tsai, Xia 2026) (paper, 2026)
• Secure and Privacy-Preserving Credentials for E-ID Proof-of-Concept (Gasser, Humbert, Elghareeb 2026) (paper, 2026)
• Spartan: Efficient and General-Purpose zkSNARKs Without Trusted Setup (Setty 2020) (paper, 2019)
• Taxonomy for Privacy-Preserving Electronic Identities (Gasser, Humbert, Elghareeb 2025) (paper, 2025)