PrivID
Privacy-preserving identity on one primitive. Prove who you are, revealing nothing but a yes or no. Two profiles: distributed-trust privacy, and post-quantum unforgeable signing.
Prove who you are, revealing nothing but yes or no. One primitive, two profiles.
The problem it solves
Passwords and central identity stores are honeypots: one breach leaks everyone, and logins reveal who-is-who across services. Meanwhile the coming quantum transition threatens the signatures that authenticate logins and documents today.
Authenticate by cryptography, not stored secrets. Every check reveals a single bit, match or no-match, and nothing else. Where the quantum transition demands it, add signing that stays unforgeable even against a quantum adversary.
Encrypted zero-detection
Every verification reduces to one test: the encrypted difference between a stored reference and a presented credential is the identity element, or it isn't. One primitive underneath both profiles.
One bit, nothing more
A check reveals exactly one bit, yes or no. The underlying identity is never exposed, not to attackers and, in the unlinkable mode, not even to the verifier.
One stack, two profiles
Both profiles share a single cryptographic core, key model, and audit pipeline. You choose the trust model per deployment without fragmenting the stack.
One primitive. Two trust models.
Both profiles run the same encrypted zero-detection core. They differ in what they verify and who they trust, so you can match each deployment to the risk it actually faces.
Distributed-trust privacy
Credential-based, privacy-preserving authentication across an untrusted validator set.
- Verification is split across independent parties. No single node can authenticate on its own.
- Validators learn one bit, accept or reject, and nothing about the credential itself.
- Cryptographically auditable logs, without ever pooling identity in plaintext.
Privacy-regulated SSO and access control in healthcare, finance, and the public sector.
Distributed threshold · privacy-preservingPost-quantum unforgeable signing
Authentication bound to a lattice signature, so passing the check proves the signature is valid and bound to the right user-service context.
- Built on CRYSTALS-Dilithium, the NIST FIPS 204 lattice-signature standard (Module-LWE).
- Signatures stay unforgeable even against a full-scale quantum adversary.
- Graceful degradation: even if the classical layer were broken, signatures still cannot be forged.
Post-quantum signing, document authentication, device attestation, and unlinkable login.
Quantum-resistant signingPrivID for PQC runs in two modes
NIST FIPS 204 · CRYSTALS-DilithiumOne switch per relying party trades privacy strength against verification cost. Both modes share the same unforgeable signing core.
Fast, deterministic verification with replay and cross-context protection. A linkable pseudonym, ideal for signing, document authentication, and device attestation.
Re-randomized every session, so even the verifier cannot correlate or identify you. Trades some verification cost for verifier-side anonymity.
Quantum resistance here means unforgeable signing. The identifier-privacy layer rests on classical assumptions today, so this is a transitional hybrid, not full post-quantum privacy. Closing that gap is a defined roadmap item, not a shipped claim.
How the shared core verifies
Whatever the profile, verification is the same encrypted zero-detection. Only the object being verified changes.
Register encrypted
The reference, a credential or a signature-bound identifier, is stored only in encrypted form. No plaintext is kept.
Present a credential
At login the user presents a freshly bound credential or signature, never the underlying identity.
Compare while encrypted
The system takes the homomorphic difference between reference and presentation, still encrypted throughout.
Reveal one bit
A public zero-test decides match or no-match. Nothing but that single bit is ever revealed.
Wondering if this fits your environment?
Take 15 minutes with a security engineer, against your real workload.
Related use cases
See where this runs in production, across AI, finance, and core enterprise systems.
Frequently asked
Quick answers about this product.
Instead of a shared secret, you prove who you are with a key you hold. No password is stored on the server, which removes an entire class of account-takeover risk: credential leaks, reuse, and phishing.
The same person can authenticate to different services with identities that can't be correlated to one another. Even if those services pool their data, they can't easily link the activity back to a single individual.
For PrivID it means quantum-resistant signing. The signature layer is built on CRYSTALS-Dilithium, the NIST FIPS 204 lattice standard, so signatures stay unforgeable even against a full-scale quantum computer. It also has graceful degradation: even if the classical elliptic-curve layer were broken, signatures still can't be forged. To be precise, that quantum guarantee applies to unforgeability. The identifier-privacy layer still rests on classical assumptions today, so this is a transitional hybrid rather than full post-quantum privacy, which is a defined roadmap item.
PrivID's post-quantum profile makes signing unforgeable against quantum adversaries. Its identifier-privacy layer rests on classical assumptions today; full post-quantum privacy is a defined roadmap item.
Identity without the honeypot.
Talk to us about privacy-preserving identity and post-quantum signing.