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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

This is our world now. The world of the electron and the switch; the beauty of the baud. We exist without nationality, skin color, or religious bias. You wage wars, murder, cheat, lie to us and try to make us believe it's for our own good, yet we're the criminals. Yes, I am a criminal. My crime is that of curiosity. I am a hacker, and this is my manifesto. You may stop me, but you can't stop us all.

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What do you think of the term "hacker"?  Do you think of crime, danger or intrusion when you hear it?  Or maybe security, programming and computer analysis.  Do you call yourself a hacker because you know how to make malicious applications or use applications that have been programmed by professionals to do your malicious tasks?  I personally believe that a hacker is someone that has an expertise in the computer system, finding exploits and has the ability to find holes on system and mend it.  Do not believe in what i said, but let's hear what do you think of the word "hacker".