BioBind binds biometric deduplication to zero-knowledge authentication
Original title: BioBind: Binding Biometric Deduplication to Zero-Knowledge Authentication
A prototype rejects tested composition attacks; its unlinkable circuit uses 31,445 constraints and about 305,000 gas.
BioBind is a protocol that binds an off-chain biometric deduplication query, gallery insertion and issued commitment to one captured vector, then links credential use to the enrolled template and a fresh device-originated probe. Capture and large-scale private deduplication stay off chain, while smart contracts authorize issuance and use. A prototype using LFW face features rejects the tested composition attacks, and encrypted enrollment tests complete three histories of 16,384 registrations without decoding errors at tested checkpoints. Full backend integration remains open.
Unconfirmed: Full backend integration is not yet demonstrated.
- Witness-plus-proving medians are 1.989 seconds versus 1.119 seconds with device-trusted matching.
- On Bosphorus, appearance changes evade deduplication in 1.8% of re-enrollment attempts.
- The encrypted instance uses bound requests, stale-session rejection and committee-confirmed migration.
- A correct verdict covers only the checked inputs and gallery snapshot.
From the original article
1 min read at arxiv.orgBiometric identity systems for decentralized applications need credentials that resist repeated enrollment and support private, publicly verifiable authentication. Capture and large-scale private deduplication run off chain while smart contracts authorize issuance and use; these stages span distinct trust domains, and a correct verdict covers only the checked inputs and gallery snapshot.
By Taotao Wang · arxiv.org
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