Four cents to deanonymize: Companies reverse hashed email addresses

Presidio

An open-source framework for detecting, redacting, masking, and anonymizing sensitive data (PII) across text, images, and structured data. Supports NLP, pattern matching, and customizable pipelines.

The False Allure of Hashing for Anonymization

Hashing is not sufficient for anonymization no. But still it is good enough for pseudonymization (which is allowed by the GDPR)

Why differential privacy is awesome

Explain the intuition behind differential privacy, a theoretical framework which allow sharing of aggregated data without compromising confidentiality. See follow-up articles with more details and practical aspects