LinkedIn flips the two-factor authentication switch

A posting from Naked Security on LinkedIn authentication:  Happy anniversary of getting the bejeezus hacked out of you, LinkedIn!
Maybe the timing is just a coincidence, but the career-toned social networking site got savagely hacked on 5 June 2012.
Cybercrooks stole about 6.5 million passwords, over 60% of which were cracked within the span of one measly day.
The attack resulted in a variety of nastiness, including a pump-and-dump stock scam and a $5 million class action lawsuit (dismissed in March).

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