breaches.nudgesecurity.com
Searchable timeline of publicly reported breaches with affected organizations, dates and data types.
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Published directory entries matching your search.
idtheftcenter.org
Identity Theft Resource Center database documenting publicly reported US data compromises.
rand.org
RAND study of illicit online markets and the operational lessons they present for public policy.
sizeof.cat
Research article cataloging ransomware leak sites and explaining how their status is tracked.