When we think about IT security, we typically think about the large hacks that were reported in the press. When viewed as a whole, we can understand the magnitude of lost data. It’s no surprise that these hacks are what come to mind when we think about information security.

The table below shows some of the largest hacks that occurred this century. The number of accounts affected range in the millions.

Greatest Security Breaches, 2003–2018, Ranked

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