Hi, thank you guys, @nrickert , @Knurpht and @malcolmlewis , you are extremely helpful and responsive.
I am not going to quote for this for the sake of saving space 
I never would think that the password is root password 
I will update it at next boot.
I heard there was a signing key update for openSUSE but I thought the updater (zypper dup) could take care of this.