Along with boosts in speed and thoroughness of its password guessing, Marlinspike says CloudCracker will now also offer APIs that mean developers could build applications that use its password cracking resources within other programs, or even on mobile devices with an Android or iPhone app.

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Those include vulnerability to denial of service attacks, which overload servers with thousands of simultaneous requests for data, as well as basic hacking tactics like guessing the password of users who fail to change default settings.

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But Passport, which stores personal information on Microsoft's servers, still lets customers use wildly insecure passwords like "password, " and lets anyone who knows your zip code take several cracks at guessing the personal "secret question" that resets the password.

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