I have to upload a new application, It's just the design that's a little different. Yesterday I generated the keystore file to sign application. Can I use the same?
So yes, you can use the same keystore to sign multiple apks, without a problem. You can also use the same alias (each alias is a certificate) to sign multiple apks, and it will work.
And the only way you can sign with a different alias would be to clone the previous one as the answer also suggests.
Keystores are simply files in a format used by java for storing keys and certificates. They do not contain any information which ties them to a particular system. They can be freely copied between systems and directories as required.
A keystore is a storage mechanism for security certificates. A public key certificate is used to sign an APK before deployment to services like the Google Play Store.
You can use that keystore
for any number of applications.
No need to generate a new keystore.
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