Lost old keystore, need to sign the app with new keystore [duplicate]

This question already has answers here: Closed 11 years ago.

Possible Duplicate:

I lost my .keystore file!

I have lost the old keystore for Android app published on Market. I don't want to rep开发者_如何学Cublish it with different package.

1. Can I get old certificate through signed original old apk?
2. Can I signed the apk with multiple keystore?

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No, public-private key security mechanism are setup specifically to avoid being able to reconstruct the certificate.

If you've lost your keystore then you're basically stuck.

Always backup your keystore and store it in a secure place (or places).