Recompile apk using original certificate

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So is it possible to recompile an apk that is decompiled using apktool to use the original certificate or signed with same certificate as it was before decompiled? Scenario : I decompile an apk with apktool and make some changes in it and recompiles using apktool but do not use apk signer instead it signed with its original certificate. Thanks.

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Probably you can't. To sign the apk with a certain certificate, you need its password and the private info. It's no enough to get the original certificate only by a release apk.

This is the way how Android Apk protect itself from repack and identify the official organization.