I&#39;m trying to import a trusted certificated into the [Java cacerts keystore][1], but I have a problem. I tried to list existing trusted certificates and it seems that the keystore isn&#39;t password protected. 

    $ keytool -list -keystore cacerts
    Enter keystore password:
    
    *****************  WARNING WARNING WARNING  *****************
    * The integrity of the information stored in your keystore  *
    * has NOT been verified!  In order to verify its integrity, *
    * you must provide your keystore password.                  *
    *****************  WARNING WARNING WARNING  *****************
    
    Keystore type: JKS
    Keystore provider: SUN
    
    Your keystore contains 76 entries

I tried to import a trusted certificate:

    $ keytool -importcert -alias &quot;JiraCert&quot; -file /root/c9ssl.crt -keystore /etc/java-6-sun/security/cacerts
    Enter keystore password:  
    Keystore password is too short - must be at least 6 characters
    Enter keystore password:  
    Keystore password is too short - must be at least 6 characters
    Enter keystore password:  
    Keystore password is too short - must be at least 6 characters
    Too many failures - try later

I also tried to change the password from &quot;none&quot; to something:

    $ keytool -storepasswd -keystore cacerts.back
    Enter keystore password:
    Keystore password is too short - must be at least 6 characters
    Enter keystore password:
    Keystore password is too short - must be at least 6 characters
    Enter keystore password:
    Keystore password is too short - must be at least 6 characters
    Too many failures - try later

  [1]: http://confluence.atlassian.com/display/JIRA/Connecting+to+SSL+services

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How do I get into a non-password protected Java keystore or change the password?