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Identity Theft Resource Center database documenting publicly reported US data compromises.

RAND study of illicit online markets and the operational lessons they present for public policy.

Research article cataloging ransomware leak sites and explaining how their status is tracked.

Checker for seeing whether an email appears in the historical Ashley Madison breach dataset.

Historical lookup showing whether an IP address appeared as a Tor relay on a specified date.

Checker for seeing whether a phone number or profile appears in Facebook-related breach data.

Public breach-awareness service for checking whether an email address appears in known data breaches.

Leak-awareness search page for checking whether identifiers appear in exposed datasets.

Exposure checker for seeing whether a password or email appears in known breach data.

Tor Project documentation portal for onion-service applications, standards and operator tools.

Network test that checks whether Tor access appears blocked and contributes measurement data.

Cybernews checker for seeing whether an email or phone appears in known data leaks.

Python controller library for applications that monitor or manage Tor processes.

Official page that tests whether the current connection appears to be using the Tor network.

Twisted-based Python library for controlling Tor and building onion-service applications.