keytool error Keystore was tampered with, or password was incorrect

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From your description I assume you are on windows machine and your home is abc

So Now : Cause

When you run this command

keytool -genkey -alias tomcat -keyalg RSA

because you are not specifying an explicit keystore it will try to generate (and in your case as you are getting exception so to update) keystore C:\users\abc>.keystore and of course you need to provide old password for .keystore while I believe you are providing your version (a new one).

Solution

  1. Either delete .keystore from C:\users\abc> location and try the command
  2. or try following command which will create a new xyzkeystore: keytool -genkey -keystore xyzkeystore -alias tomcat -keyalg RSA

Note: -genkey is old now rather use -genkeypair althought both work equally.

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