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Application & OT Security · Advanced

Reproducible Build

A build process that produces bit-for-bit identical output from the same source, allowing anyone to verify that a binary matches its source.

Definition

Reproducibility requires removing nondeterminism such as timestamps, file ordering and environment differences. Independent rebuilds can then detect a compromised build system, as advocated by the Reproducible Builds project.

Example

Two independent parties rebuild a Debian package and confirm identical SHA-256 hashes.

Exam tip

Reproducible builds detect build-system tampering.

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