Get Amazed!! Top Ex-hacker Who Turned Billionaires

Jan Koum, whose net worth suddenly jumped to $6.8 billion last month when his startup WhatsApp was acquired by Facebook, began his tech career as a teenage immigrant from Ukraine and fan of the 1995 film ‘Hackers.’ From the privacy of his Mountain View, Calif. bedroom, he’d use his wardialer—a machine that cycles through phone numbers, dialing them on a modem to find open connections—to probe the global Internet and explore faraway networks.

Koum said“The Internet was so insecure back then,”  “Servers on the fringes of the Internet with root account and no passwords…The challenging part was finding these systems where you have to learn your way around. There were no manuals.” He added

Once, Koum admits, he found his way onto the network of the computer graphics giant Silicon Graphics, a story that the 38-year-old CEO is careful to leave unfinished. “At some point I connected to the server,” he says. “And that’s as much as I’m going to say.

Bill Gate and co-founder Paul Allen  In the late 60s, the two teenagers were caught with unauthorized access to an administrator account at Computer Center Corporation and even rummaged through its Dumpster for printouts of source code, according to Allen’s memoir

 Zuckerberg used login records on TheFacebook.com to break into the email accounts of Harvard Crimson reporters, according to reporting by Business Insider’s Nicholas Carlson.

 Twitter co-founder Jack Dorsey got his first job by breaking into the network of the dispatch company he hoped would hire him to show the company its security vulnerabilities

Late Steve Jobs and Apple co-founder Steve Wozniak: No one, perhaps, has better captured the importance of hacker experimentation for innovation better than the late Steve Jobs, who once partnered with Apple co-founder Steve Wozniak to sell “Blue Boxes,” tools that skirted the phone companies’ security measures to allow free calls. “If it hadn’t been for the Blue Boxes,” Jobs told his biographer Walter Isaacson before his death, “There would have been no Apple.