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Application & OT Security · Advanced

Android App Signing

Signing Android apps with a developer key so the OS can verify app origin and ensure updates come from the same developer.

Definition

Android verifies signatures at install and update using APK Signature Schemes v2, v3 and v4. With Play App Signing, Google manages the app signing key while developers use an upload key. Updates must be signed with the same key (or a rotated key per v3 lineage).

Example

A modified APK fails to install as an update because its signature does not match the original.

Exam tip

Signature consistency is what blocks malicious updates of an installed app.

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