unlinkability

DEPRECATED - Client for Privacy Pass protocol providing unlinkable cryptographic tokens

Implementation of the local and global unlinkability metrics for biometric template protection systems

Maximal Linkability metric to evaluate the linkability of (protected) biometric templates. Paper: "Measuring Linkability of Protected Biometric Templates using Maximal Leakage", IEEE-TIFS, 2023.

Auditably privacy-preserving age verification with RFC 9474 RSA blind signatures. A relying party learns only the age predicate (over-13/18/…); the issuer never sees the nonce, token, or site; unlinkability is verifiable, not promised. Python uv workspace. Research prototype — unaudited.

Agent messaging that needs no trusted server. The host can be any S3 bucket, and it learns nothing.

One-bit, unlinkable, stateless age verification — the ZK verifier the EU didn't ship. Proof in → true/false out. Replaces ID uploads and face scans. Built on google/longfellow-zk.

Open specification for a privacy-native authentication protocol. Proves validity without recording identity. Built on WebAuthn, ZKP, and NFC proximity. — I. Smid-Woelders, 2026

A privacy-preserving, revocable, multi-verifier credential system with auditability and unlinkability.

Measures what verifiable unlinkability costs at agent action rates — and what breaks when the pre-computation pool runs out. Real BBS+ over BLS12-381, an Ed25519 baseline, and clearly-marked stubs. Supporting tool for P05.

Browser-based Sphinx mix packet demo — Danezis and Goldberg, IEEE S&P 2009, over ristretto255 with LIONESS wide-block payload protection. Fixed-length headers, per-hop blinding, replay tags and tagging attacks across three mixes — then one sender on a quiet network is traced end to end with every check green.

Browser-based BBS+ selective disclosure demo — BLS12-381 pairings. A signed credential is all-or-nothing: to prove one field you hand over the whole document. BBS+ proves knowledge of the issuer's signature while revealing only what you choose — and randomizes every presentation, so two showings are unlinkable. Revocation is the honest tension.

Browser-based blind signature demo — Chaum RSA blind signatures, Schnorr EC blind signatures, anonymous e-cash, private voting, and unlinkability proofs. No backends. No simulated math.