Comparison

Confium occupies a specific niche in the trust-infrastructure landscape: open-source, standards-only, threshold-native, with a path to post-quantum migration that doesn’t require replacing hardware. This page maps that niche against the alternatives.

At a glance

Property Confium HSM (single-key) Conventional CA Cloud KMS Sigstore Commercial threshold
Open source ✓ BSD-2-Clause varies ✗ ✗ ✓ Apache-2.0 ✗
No single point of compromise ✓ structural ✗ (single HSM) ✗ (single CA key) ✗ (KMS holds key) ✗ (Cosign) ✓ structural
Standards-only adapters ✓ PKCS#11 / OpenSSL / JCE / TLS ✓ PKCS#11 varies limited ✗ own API usually
Async (offline-tolerant) sessions ✓ structural n/a n/a ✗ ✗ varies
Post-quantum migration path ✓ composite sigs ✗ (HSM replacement) ✗ varies ✗ varies
Transparency log built in ✓ RFC 6962 ✗ varies ✗ ✓ Rekor varies
Attribute-based quorum ✓ DSL ✗ ✗ limited ✗ limited
FIPS 140 mode ✓ via plugin ✓ (HSM itself) varies ✓ ✗ ✓
Jurisdictional algorithm policies ✓ per-deployment limited varies limited ✗ limited
Long-term archival (ERS, OTS) ✓ both ✗ varies ✗ ✗ varies
Licensing cost Free $$ (hardware) $$ (subscription) $ (per-call) Free $$$ (subscription)

Confium vs HSM (single-key)

A Hardware Security Module stores a single private key in tamper-resistant hardware. Compromise requires physical access plus PIN compromise — but once compromised, the attacker has the full key and can sign anything until the HSM is revoked.

Use HSM when:

  • You need the highest physical-security assurance (FIPS 140-2 Level 3+).
  • Single-key operation is acceptable.
  • You already have HSMs and want to keep using them.

Use Confium when:

  • No single party can be trusted with the key.
  • You need quorum governance (multi-stakeholder signing).
  • You want software-only operation without specialized hardware.

Best together: Confium integrates with HSMs via PKCS#11. Each signer can store its share in an HSM, combining HSM-grade physical security with Confium’s threshold governance.

Confium vs conventional CA

A conventional Certificate Authority (DigiCert, Sectigo, Let’s Encrypt) holds a single private key that signs certificates. The CA operator is trusted not to misuse the key.

Use conventional CA when:

  • You’re issuing TLS certificates for the public web (use Let’s Encrypt).
  • You trust the CA operator.
  • Single-stakeholder model fits your org.

Use Confium Mode 3 (Sovereign PKI) when:

  • No single stakeholder can be trusted.
  • You need custom certificate formats or delegation rules.
  • You want a public, auditable record of every certificate ever issued.

Confium vs cloud KMS

AWS KMS, Google Cloud KMS, and Azure Key Vault offer hosted cryptographic key storage. The cloud provider holds (or shards) the key; you call an API to sign.

Use cloud KMS when:

  • You’re already on one cloud and want minimal operational overhead.
  • Single-cloud trust model is acceptable.
  • You want tight IAM integration with cloud-native workloads.

Use Confium when:

  • You need cross-cloud or on-prem deployment.
  • You want the key split across organizations, not just shards within one provider.
  • Compliance requires open-source, auditable crypto layer.

Best together: Confium has a confium-store-cloud backend that uses cloud KMS as one share storage option among many.

Confium vs Sigstore

Sigstore is an open-source project for software supply-chain signing. It uses ephemeral keys, OIDC-based identity, and a transparency log (Rekor). It’s optimized for code signing in CI/CD pipelines.

Use Sigstore when:

  • You’re signing container images, Python packages, or other build artifacts in CI.
  • You want keyless signing tied to GitHub / GitLab identity.
  • Single-signer-per-build is acceptable.

Use Confium when:

  • You need multi-stakeholder quorum (e.g. release requires 2-of-3 maintainers).
  • You need threshold key escrow or recovery.
  • You’re signing certificates, documents, or anything that isn’t a build artifact.

Best together: Confium’s confium-cms produces standard CMS SignedData that Sigstore-style verifiers can consume.

Confium vs commercial threshold solutions

Companies like Unbound (acquired by Coinbase), Sepior (acquired by Coinbase), and others offer commercial threshold cryptography products.

Use commercial threshold when:

  • You want vendor support and SLA.
  • The vendor’s specific protocol (often MPC variants) meets your needs.
  • Proprietary licensing is acceptable.

Use Confium when:

  • Open-source is a hard requirement.
  • You need standards-only integration (PKCS#11, OpenSSL, JCE).
  • You want to avoid vendor lock-in.
  • You’re deploying in a jurisdiction where the vendor isn’t available.

What Confium is not

  • Not a CA in a box. Confium is the cryptographic layer; you bring the policy, the certificate formats, and the governance.
  • Not an HSM. Confium is software. Use HSMs alongside Confium if you need hardware-grade key protection.
  • Not a cloud service. Confium runs wherever you run it. No vendor-hosted version.
  • Not a Sigstore replacement for code signing. Different scope, different protocols.

When to choose Confium

Pick Confium if any of these describe your situation:

  1. You’re an institution where no single party can be trusted with the signing key.
  2. You need post-quantum migration without re-issuing every certificate.
  3. You want a public, auditable record of every signing operation.
  4. You need cross-jurisdiction deployment with per-jurisdiction algorithm policies.
  5. You’re building a distributed system where multiple parties must cooperate to sign.
  6. Open-source + standards-only is a non-negotiable.

If none of these apply, conventional PKI or a cloud KMS may serve you just as well — at lower operational complexity.

See also