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Google’s SLSA Framework To Protect Against Common Supply Chain Attacks

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Google has introduced Supply chain Levels for Software Artifacts (SLSA), an end-to-end framework for ensuring the integrity of software artifacts throughout the software supply chain.

“The goal of SLSA is to improve the state of the industry, particularly open source, to defend against the most pressing integrity threats. With SLSA, consumers can make informed choices about the security posture of the software they consume,” Google explained in a blog post.

The framework is inspired by Google’s internal “Binary Authorization for Borg” which has been in use for the past 8+ years and is mandatory for all of Google’s production workloads.

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In its current state, SLSA is a set of incrementally adoptable security guidelines being established by industry consensus. In its final form, SLSA will differ from a list of best practices in its enforceability: it will support the automatic creation of auditable metadata that can be fed into policy engines to give “SLSA certification” to a particular package or build platform.

The framework consists of four levels, with SLSA 4 representing the ideal end state. The lower levels represent incremental milestones with corresponding incremental integrity guarantees.

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