Those browsers could cover a hacker's tracks to illegal sites or hide a hacker's anonymous attacks through the Web.

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Geo-caching is an offshoot of a geek pastime called hacker tourism which essentially involves visiting sites of interest to technology or gadget lovers.

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It's also a handy marketing gimmick: ScanAlert users get to slap a "Hacker Safe" seal on their Web sites, potentially easing skittish customers' fears.

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