In the old days, criminals liked their ransom payments in briefcases full of unmarked bills. These days, there's a new preferred method for hostage takers: the virtual currency Bitcoin.
In a modern day version of a mob shakedown, hackers around the world have seized files on millions of computers, taken down public websites and in a few cases, even threatened physical harm.
The victims -who have ranged from ordinary computer users to financial firms and police departments -are ..
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