San Francisco's Muni transit system hacked, resulting in free rides for all

The nightmare hacking scenario many have feared has finally happened near the heart of Silicon Valley: a major rapid transit system has been hacked. 
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San Francisco's Municipal Transportation System, known locally as Muni, was hacked on Friday, with hackers leaving the message 'You Hacked, ALL Data Encrypted,' on Muni computer screens around the city on Saturday, according to the San Francisco Examiner.
The messa