Longfellow ZK
lastmod 2025-07-05created 2025-07-052 edits
Google open-sources its 'Zero-Knowledge Proof (ZKP)' technology
The Longfellow library enables the construction of zero-knowledge protocols concerning legacy identity verification standards such as the ISO MDOC standard, the JWT standard, and W3 Verifiable Credentials. This implementation is described in:
It is named after the bridge outside the Google Cambridge office.
Features
- Zero-Knowledge Proof (ZKP) is a cryptographic technique that makes it possible to prove a specific fact (e.g. being 18 or older) without exposing personal information
- This technology is expected to accelerate the implementation of next-generation identity authentication and privacy protection services, such as the European Union (EU) Digital Identity Wallet (EUDI Wallet)
- Freely available to developers, companies, and researchers alike, and expected to be a great help in building public and private privacy-enhancing services
- Google hopes that open-sourcing ZKP will help everyone move toward a safer digital ecosystem