A Hacker is cleaver System Programmer. And he/she interested in playing with system securities and other electronic devices. Hacker is passionate about learning in how a system will work, and finding new things. In the business of hacking there are three types of hacker.
1. White Hat Hacker : These hackers are considered as good guys . They don't use their hacking methods for doing illegal things. White hackers will help people from being hacked.
2. Grey Hat Hacker : Grey Hat Hackers are do both good things and bad things. They do legal and illegal things.
3. Black Hat Hacker : Black Hat Hackers are show their skill using hacking websites and stealing passwords and Creating some Trojan Malware Fuctions etc.
Top 5 Computer Hackers Ever
1. Kevin Mitnick
Kevin Mitnick is a most famous hacker. He is the author of two books The Art of Deception & The Art of Intrusion. He damaged some Communication networks like Nokia, Motorola and Sun Microsystem etc. Kevin Mitnick has damaged DEC systems source code [Digital Equipment Corporation has spent around $160,000 in cleanup the DEC systems]. To to win a bet he occupied administration privileges to IBM Computers at the Computer Learning center in LA [Los Angeles] .
2. Adrian Lamo
Adrian Lamo is a Grey Hat Hacker. Using his hacking skill he hacked many computer networks like The New York Time, Yahoo, Microsoft .
3. Gary Mckinnon
Source: BBC News
4. Robert Tappan Morris
5. Jonathan James
Jonathan James is an American hacker. He damaged NASA Systems, It costed $41,000 to fix the systems.
Jonathan stealed software from NASA It worth $1.7 Million.
Source wikipedia






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