SLSA specification

SLSA is a specification for describing and incrementally improving supply chain security, established by industry consensus. It is organized into a series of levels that describe increasing security guarantees.

This is the Working Draft of what the next version of the SLSA specification might be. It defines several SLSA levels and tracks, as well as recommended attestation formats, including provenance.

Understanding SLSA

These pages provide an overview of SLSA, how it helps protect against common supply chain attacks, and common use cases. If you’re new to SLSA or supply chain security, start here.

Page	Description
What’s new	The changes brought by this Working Draft.
About SLSA	An introductory guide to SLSA
Supply chain threats	An introduction to supply chain threats
Use cases	Use cases
Guiding principles	Use cases
FAQ	Questions and more information
Future directions	Additions and changes being considered for future SLSA versions

Core specification

These pages describe SLSA’s security levels and requirements for each track. If you want to achieve SLSA a particular level, these are the requirements you’ll need to meet.

Page	Description
Terminology	Terminology and model used by SLSA
Security levels	Overview of SLSA’s tracks and levels, intended for all audiences
Producing artifacts	Detailed technical requirements for producing software artifacts, intended for platform implementers
Distributing provenance	Detailed technical requirements for distributing provenance, intended for platform implementers and software distributors
Verifying artifacts	Guidance for verifying software artifacts and their SLSA provenance, intended for platform implementers and software consumers
Verifying build platforms	Guidelines for securing SLSA Build L3+ builders, intended for platform implementers
Threats & mitigations	Detailed information about specific supply chain attacks and how SLSA helps
Securing Source Code	Overview of the Source track

Attestation formats

These pages include the concrete schemas for SLSA attestations. The Provenance and VSA formats are recommended, but not required by the specification.

Page	Description
General model	General attestation mode
Provenance	Suggested provenance format and explanation
Verification Summary	Suggested VSA format and explanation

How to SLSA

These instructions tell you how to apply the core SLSA specification to use SLSA in your specific situation.

Page	Description
For developers	How to apply SLSA requirements to your build
For organizations	How to apply SLSA to an organization
For infrastructure providers	How to implement SLSA in source, build, and package platforms