Increasingly, identity theft is a fact of life. We might once have hoped to protect ourselves from hackers with airtight passwords and aggressive spam folders, and those are good ideas as far as they go. But the truth is, there are people out there -- a lot of them -- who treat stealing your identity as a full-time job.One such company is a nameless firm located in Russia, which has a trove of over a billion internet passwords. Another set up a website...