Geo-caching is an offshoot of a geek pastime called hacker tourism which essentially involves visiting sites of interest to technology or gadget lovers.
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.
Last year independent hacker Moxie Marlinspike created a tool call SSLstrip to invisibly remove the SSL protections on secure sites when a user click through from an insecure site.
Cloud storage on third party sites, he contends, is not a panacea: in addition to the hacker threat, he sees potential legal issues if your hosting site happens to go out of business.
It is understood to be a separate organisation from Anonymous, the "hacker collective" which has been linked to a number of high profile web attacks including several on Sony sites.