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

Gary Mckinnon is a Biggest Military Computer Hacker of all time. In one interview Gary Mckinnon said "Hacked into US military computer systems looking for information about UFO's". He Broken security systems of NASA and Pentagon And using his hacking skill he hacked 97 Computer systems [It damaged around $700,000 to the society].
Source: BBC News

4. Robert Tappan Morris

Robert Tappan Morris is Created the first Computer worm on the Internet in 1988 and named it as Morris Worm. Robert Tappan Morris now working as Professor at MIT CS and Artificial Intelligence Laboratory.

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.