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Android Application Security Essentials by Pragati Ogal Rai

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Application signing

One of the differentiating factors of Android is the way Android applications are signed. All applications in Android are self-signed. There is no requirement to sign the applications using a certificate authority. This is different from traditional application signing where a signature identifies the author and bases trust upon the signature.

The signature of the application associates the app with the author. If a user installs multiple applications written by the same author and these applications want to share each other's data, they need to be associated with the same signature and should have a SHARED_ID flag set in the manifest file.

The application signature is also used during the application upgrade. An application ...

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