The Signing key of an Android app is the key with which an Android device verifies the identity of the app developer who built the app. - cc: android hackernoon android androidappdevelopment
Say a developer publishes an app on Google PlayStore. The app is verified by Google, released to users, and becomes a success! It garners thousands of users every day. A month later, a bug shows up in the app.
On the other hand, developers who lose their signing key are no longer able to maintain and provide updates to their own apps. This way, the actual APK that is downloaded to the user’s phone remains decipherable to the PlayStore backend.An Upload Key is the key with which the developer signs the AAB file contents, and this is signed and verified between the developer and Google’s PlayStore backend.
So essentially, the Signing Key is the key that the user’s Android phone will verify against. It will check every subsequent update of an app to be signed with the same Signing Key as the previous one, and thereby the key that is actually signed by Google.
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