softwaresupplychain

Verifying Sigstore Bundles as an End User

May 2, 2025 · Zach Steindler (GitHub)

There’s a mnemonic for quickly determining if a bicycle is safe to ride: “ABC” for checking the air in the tires, ensuring the brakes are functional, and checking the chain. It doesn’t definitively answer the question “is this bike safe?” but it does give you a quick starting point for your assessment. Let’s say you download some software and it comes with a Sigstore bundle. Similarly, there isn’t a quick, definitive answer to “is this software safe to use?

cosign Verification of npm Provenance, GitHub Artifact Attestations, and Homebrew Provenance

Aug 27, 2024 · Zach Steindler (GitHub)

One of the features of the cosign v2.4.0 release allows you to verify attestations in the bundle format used by npm provenance, GitHub Artifact Attestations, and Homebrew provenance. This is part of all Sigstore clients supporting the bundle format as outlined in the community roadmap. We’ll show how to perform that verification for each ecosystem, and explain some of the details involved. You’ll notice these examples follow the same general pattern of getting an artifact to verify, getting the bundle that contains the signed attestation about that artifact, and then providing a verification policy to cosign via command line flags.

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Sigstore January Roundup

Feb 1, 2023 · Sigstore

This month, we are thrilled to have announced the 1.0 release of sigstore-python. This project started a year ago to provide a Sigstore-compatible client similar to cosign, but built entirely with Python and easily adoptable by the Python ecosystem. A big thank you to all the contributors and maintainers for making it to 1.0! Read more Latest Blog Posts Thank you to Andrew, Felix and Zachary for contributing the following blog posts this month.

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Sigstore December Roundup

Dec 23, 2022 · Sigstore

“And lo, in the land of software package management, a system was born to bring order and trust. Sigstore was its name, and its mission was to sign packages with short-lived certificates, validated by a powerful OIDC provider. These signed packages were then placed in a transparency database for all to see, like a holy book open for all to read and verify. Sigstore was a beacon of hope in a chaotic world, shining brightly as a protector of software integrity.

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Signatus, ergo securus? Who can sign what with TUF and Sigstore

Dec 13, 2022 · Zachary Newman, Marina Moore

Photo by Brett Jordan on Unsplash Sigstore is an open-source project and service run by the OpenSSF to make signing software easy! Before Sigstore, a developer who wanted to sign software needed to manage a GPG key. With Sigstore, they can use their identity (for instance, a Gmail account) to sign. It also brings transparency: actions must be posted on a public log, so they can be audited to detect bad behavior and to analyze damage after-the-fact.

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New Sigstore Landscape: Add your signed project

Nov 30, 2022 · sigstore

A Sigstore section was added to the Open Source Security Foundation (OpenSSF)’s Landscape. The aim of the Sigstore Landscape is to show the collection of technologies that make up the project’s growing ecosystem. This gives everyone a great overview of how everything fits together. Landscape Sections The Sigstore Landscape currently has seven different sections. Architecture/Spec Sigstore is a new standard for signing, verifying and protecting software. It can be used to make sure your software is what it claims to be.

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Using Sigstore to meet FedRAMP Compliance at Autodesk

Nov 23, 2022 · Sigstore

This is a Sigstore case study contributed by Jesse Sanford of Autodesk In today’s *-as-a-Service world, platforms are everywhere. Products as complex as entire operating systems and as simple as shared libraries are built and maintained on them. As software engineers, we leverage them for common capabilities. This allows us to focus on our customer needs and leave other cross-cutting concerns to the subject matter experts. Typically, security and compliance capabilities are particularly well suited for being delegated to the platform.

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'Sigstore: Software Signing For Everybody' has been published in the proceedings of the ACM Computer and Communications Security Conference

Nov 17, 2022 · Zachary Newman, John Speed Meyers, Santiago Torres-Arias

Photo by Bank Phrom on Unsplash Sigstore: Software Signing for Everybody has been published at the 2022 ACM Computer and Communications Security (CCS) conference in Los Angeles, CA, an academic computer security conference, featuring publications from research universities around the world and industry labs at organizations like Google, Microsoft, Meta, and Amazon. This peer-reviewed research paper describes Sigstore, its security model, some data about its usage, and potential applications and is freely available under a CC-BY 4.

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A New Look for Sigstore

Sep 21, 2022 · di_codes

You may have noticed Sigstore has a brand new logo! And not just the main logo but there are new logos for Rekor, Cosign, Fulcio and Gitsign. As the community works towards GA, we also wanted to spend some time sprucing up the Sigstore brand! We’re happy to share the new Sigstore logos and color palette. New Logo In November 2021, Sigstore joined the Open Source Security Foundation (OpenSSF) as a project.

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Sigstore Update — September 2022

Sep 8, 2022 · Tracy Miranda

SigstoreCon The SigstoreCon call-for-papers closed last month and the program committee has been busy ranking the 23 great submissions received. Many thanks to all who submitted talks. And thanks to our program committee members: Priya Wadhwa, Lily Sturman, Appu Goundan, Jacques Chester, and Batuhan Apaydin. The program will be announced on September 13. We hope to see you at SigstoreCon our first official event, on October 25 in Detroit, in co-location with KubeCon + CloudNativeCon North America.

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