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Can someone out there tell us what are the differences between a hacker and an ethical hacker?  The first thing that comes in mind would be (1) a hacker is someone bad hacking computers whereas (2) an ethical hacker is someone that hacks but it is for the goodness.  Alright here comes the contradiction, my professor called Ali says that "if there is an ethical hacker, can there be an ethical liar or an ethical murderer