Black Hat 2015 is underway, and the corporate side of hacking has taken center stage. There are plenty of hot topics this year, but the mess at the OPM is something that is still generating buzz months after the fact.

Last month, House Oversight Committee Chairman Jason Chaffetz disclosed that in addition to the 4.2 million records that were previously reported compromised in June, OPM discovered a second incident during that investigation that impacted 21.5 million people, and 19.5 million of them had applied for security clearance.

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