The 15 worst data security breaches of the 21st Century

Security practitioners weigh in on the 15 worst data security breaches in recent memory.

By Taylor Armerding

Data security breaches happen daily, in too many places at once to keep count. But what constitutes a huge breach versus a small one? CSO compiled a list of 15 of the biggest or most significant breaches of the 21st century.

This list is based not necessarily on the number of records compromised, but on how much risk or damage the breach caused for companies, insurers and users or account holders. In some cases, passwords and other information were well protected by encryption, so a password reset eliminated the bulk of the risk.

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