Apr 7, 2025

Written by Ramon Petgrave (@ramonpetgrave64)

KMS Plugins for Sigstore

Cosign and private deployments of Fulcio and Rekor can use a KMS-managed key for signing artifacts. We currently have built-in support for AWS, Azure, Google Cloud Platform, and Hashicorp Vault KMSs. This has been a challenge for customers that require alternative or custom KMS solutions. To enable such use-cases, we have implemented a new plugin system for alternate KMS providers. Organizations can independently and privately develop & distribute their plugins without needing downstream updates to libraries to support additional KMS providers as build-time dependencies.

Tags:  sigstore ,  kms ,  plugin

Apr 4, 2025

Written by Mihai Maruseac, Google Open Source Security Team

Taming the Wild West of ML: Practical Model Signing with Sigstore

Over the past year, in collaboration with OpenSSF, NVIDIA and HiddenLayer, we have worked on bringing Sigstore signatures to the world of machine learning, making ML models tamper resistant via transparent signatures. Today we are pleased to announce the launch of version 1.0 of the model-signing project, built on top of sigstore-python. After installing via pip install model-signing, users can use the CLI to sign and verify models, as per the following examples:

Tags:  sigstore ,  artificial intelligence ,  model signing ,  machine learning

Mar 5, 2025

Written by Sigstore TSC

New Terraform Modules Repository

New Terraform Modules Repository The Terraform modules for running a private deployment of Sigstore have been moved to a dedicated repository, terraform-modules. We currently support Google Cloud Platform as a cloud provider. We welcome any community contributions for other cloud providers. Deprecation for Terraform Modules under Scaffolding Effectively immediately, the Terraform modules in the scaffolding repository will no longer be updated. If you are relying on Terraform for your private deployment, please update references for scaffolding to the new terraform-modules repository.

Tags:  sigstore ,  terraform

Nov 21, 2024

Written by Linus Sun (Google)

Using rekor-monitor to Scan Your Transparency Logs

Overview As part of the tool suite within Sigstore that focuses on providing transparency in the software supply chain, Rekor, Sigstore’s signature transparency log, and Fulcio’s certificate transparency log provides discoverability and auditability for signed artifact metadata and code-signing certificates. These immutable read-only logs help secure the software supply chain by making it easier to show what actions have been performed by a compromised identity. A variety of different improvements have recently been integrated into rekor-monitor to make it easier to use.

Tags:  sigstore ,  rekor-monitor ,  security ,  rekor

Nov 14, 2024

Written by William Woodruff (Trail of Bits), Dustin Ingram (Google), Hayden Blauzvern (Google)

PyPI's Sigstore-powered attestations are now generally available

Check out the PyPI blog and Trail of Bits blog for more user-facing and technical details, respectively! Over the past year, the Google Open Source Security Team and Trail of Bits have worked together to implement PEP 740, a Python packaging standard that allows users to upload Sigstore-based attestations to the Python Package Index. Today we’re pleased to announce that attestation support on PyPI is generally available, meaning that project maintainers can submit attestations for both PyPI and downstream users to verify.

Tags:  sigstore ,  security ,  pypi ,  python