A grey hat is some one with a mixture of black and white hat experience. Usually, a grey hat is someone who performs network security or system security analysis for organizations.
BOB the grey hat will scan your webserver for vulnerabilities for x amount of $. When he gets home he will reverse engineer microsoft products using stolen windows code.
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Someone who works on the computer, especially hacking that hacks into systems not to look for anomalies or to destroy a system. They're basically in there screwing around causing minor or no damage.
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A Grey-Hat is a term given to Gandalf the grey by some stupid idiots who think that he is a computer Hacker
Gandalf the Grey-hat
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It is an SEO technique used to optimize pages and websites to help rank.
ranking of pages using grey hat seo