Sigstore is a keyless code signing infrastructure that issues short-lived, ephemeral certificates tied to an OpenID Connect (OIDC) identity, such as a Google or GitHub account. Instead of managing persistent private keys, developers authenticate via their existing identity provider. The system generates a one-time signing key, records the event in a transparency log (Rekor), and immediately discards the private key, making key compromise or exfiltration practically impossible.
Glossary
Sigstore
An open-source project enabling automated, keyless signing and verification of software artifacts using short-lived ephemeral certificates linked to OpenID Connect identities.
KEYLESS SIGNING
What is Sigstore?
An open-source project that enables automated, keyless cryptographic signing and verification of software artifacts using short-lived ephemeral certificates bound to OpenID Connect identities, eliminating the operational burden of long-lived private key management.
Verification relies on the transparency log and a certificate authority (Fulcio), not on a pre-shared public key. A verifier checks the artifact's signature against the log entry to confirm the signing identity and that the signature was recorded during the certificate's brief validity window. This architecture underpins SLSA compliance and in-toto attestations, providing a scalable, open foundation for software supply chain security without the traditional overhead of key distribution and rotation.
KEYLESS SIGNING INFRASTRUCTURE
Key Features of Sigstore
Sigstore provides a free, automated, and transparent standard for signing, verifying, and protecting software artifacts. It eliminates the long-standing operational burden of key management by leveraging ephemeral keys and identity-based verification.
01
Keyless Signing via Ephemeral Certificates
Eliminates the need for developers to manage, rotate, or protect long-lived private keys. Sigstore uses the Fulcio certificate authority to issue short-lived, ephemeral code-signing certificates bound to an OpenID Connect (OIDC) identity.
- Mechanism: A key pair is generated locally and the private key is discarded immediately after signing.
- Identity Binding: The certificate proves that the signer possessed a specific email address or service account at the exact moment of signing.
- Result: No permanent secrets to leak, eliminating the risk of stolen private keys.
< 10 min
Validity Period
02
Transparent Immutable Ledger
Sigstore's Rekor component provides a tamper-resistant, append-only transparency log that records the metadata of every signing event. This allows for real-time monitoring and post-hoc auditing of the software supply chain.
- Verifiable Timestamping: Every signature entry is cryptographically hashed and time-stamped.
- Monitorship: Security teams can monitor the log for unexpected signing events or compromised identities.
- Non-Repudiation: Once recorded, a signing event cannot be secretly deleted or altered without detection.
Append-Only
Ledger Structure
03
OIDC-Based Identity Verification
Sigstore decouples trust from raw cryptographic keys and binds it to verified digital identities. It integrates with existing OpenID Connect providers (Google, GitHub, Microsoft) to establish the signer's origin.
- Federated Trust: Accepts identities from any compliant OIDC provider without a centralized user database.
- Workload Identity: Supports SPIFFE-based machine identities for automated CI/CD pipelines, ensuring only trusted build jobs can sign artifacts.
- Policy Enforcement: Allows administrators to write policies like 'only the GitHub Actions workflow from repo X can sign this container'.
OIDC
Auth Standard
SIGSTORE EXPLAINED
Frequently Asked Questions
Clear, technical answers to the most common questions about Sigstore's keyless signing architecture, its role in software supply chain security, and how it integrates with AI artifact verification.
Sigstore is an open-source project that enables automated, keyless signing and verification of software artifacts using short-lived ephemeral certificates linked to OpenID Connect (OIDC) identities. Instead of requiring developers to manage long-lived private keys manually, Sigstore binds a digital signature to an identity token issued by an OIDC provider (like Google, GitHub, or Microsoft). The signing process generates a code signing certificate valid for only 10 minutes, eliminating the risk of key leakage or theft. A transparency log (Rekor) records every signing event immutably, allowing verifiers to audit the provenance of any artifact. Verification checks the signature against the transparency log entry and the OIDC identity, ensuring the artifact was signed by the claimed identity at a specific time. This architecture removes the operational burden of key management while providing cryptographic proof of origin.
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About the author
Prasad Kumkar
CEO & MD, Inference Systems
Prasad Kumkar is the CEO & MD of Inference Systems and writes about AI systems architecture, LLM infrastructure, model serving, evaluation, and production deployment. Over 5+ years, he has worked across computer vision models, L5 autonomous vehicle systems, and LLM research, with a focus on taking complex AI ideas into real-world engineering systems.
His work and writing cover AI systems, large language models, AI agents, multimodal systems, autonomous systems, inference optimization, RAG, evaluation, and production AI engineering.
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