I think this question is very common,, but some of the user dont know who is the best hacker in the world. I searched lot for this .. finally got one final solution 
World Number 1 Hacker Is Mr.Kevin Mitnick
Kevin Mitnick
Mitnick is perhaps synonymous with Hacker. The Department of Justice still refers to him as “the most wanted computer criminal in United States history.” His accomplishments were memorialized into two Hollywood movies: Takedown and Freedom Downtime.
Mitnick got his start by exploiting the Los Angeles bus punch card system and getting free rides. Then similar to Steve Wozniak, of Apple, Mitnick tried Phone Phreaking. Mitnick was first convicted for hacking into the Digital Equipment Corporation’s computer network and stealing software.
Mitnick then embarked on a two and a half year coast to coast hacking spree. He has stated that he hacked into computers, scrambled phone networks, stole corporate secrets and hacked into the national defense warning system. His fall came when he hacked into fellow computer expert and hacker Tsutomu Shimomura’s home computer.
Mitnick is now a productive member of society. After serving 5 years and 8 months in solitary confinement, he is now a computer security author, consultant and speaker.
Confirmed criminal acts
* Using the Los Angeles bus transfer system to get free rides
* Evading the FBI
* Hacking into DEC system(s) to view VMS source code (DEC reportedly spent $160,000 in cleanup costs)
* Gaining full admin privileges to an IBM minicomputer at the Computer Learning Center in LA in order to win a bet
* Hacking Motorola, NEC, Nokia, Sun Microsystems and Fujitsu Siemens systems
Alleged criminal acts
* Stole computer manuals from a Pacific Bell telephone switching center in Los Angeles
* Read the e-mail of computer security officials at MCI Communications and Digital
* Wiretapped the California DMV
* Made free cell phone calls
* Hacked SCO, PacBell, FBI, Pentagon, Novell, CA DMV, USC and Los Angeles Unified School District systems.
* Wiretapped FBI agents according to John Markoff, although denied by Kevin Mitnick.
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