Ten Big Breaches In 2011

No one was immune: not social networks, not financial institutions, and not even security firms

What happened: Cyber-vandals defaced Valve's forum for its popular Steam game download service. The attackers had access to the database in which account information on Steam's 35 million users was stored. The company has not determined how much data was taken.

Losses: The attackers accessed a database with user names, hashed and salted passwords, game purchases, email addresses, billing addresses, and encrypted credit card information, according to Valve.

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