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The 6 worst kinds of computer hackers

Who: Anonymous, AntiSec, LulzSec

Objectives: Righting perceived wrongs, publicity, protecting Internet freedoms

Targets: Bullies, Scientologists, corporations, governments

Signature: Leaking sensitive information, public shaming, creepy YouTube videos

Classic Case: The websites of PayPal, Visa (V, Fortune 500), and MasterCard (MA, Fortune 500) were disrupted during Operation Payback, an Anonymous-led effort to punish companies that suspended the accounts of WikiLeaks in 2010. Some $5.6 million was lost by PayPal alone.

NEXT: 3. Cyber-Criminal

By Erika Fry, reporter @FortuneMagazine - Last updated February 26 2013 06:33 AM ET

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