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Crescent library brings privacy to digital identity systems (Microsoft Research, 2025)

Last modified: 2026-10-23

URL: https://www.microsoft.com/en-us/research/blog/crescent-library-brings-privacy-to-digital-identity-systems

Summary

Microsoft Research blog post introducing the open-source Crescent library, which adds unlinkability and selective disclosure to existing JWT and mDL credentials by proving their RSA/ECDSA signatures in zero knowledge (Groth16 + Sigma proofs). It describes the pre-computation/online split that makes presentations fast on phones. Directly relevant to retrofitting privacy onto existing e-ID credential formats.