Not only will hashing data not anonymize it, but regulators, including the FTC, consider hashed identifiers as personal information. Hashes aren't anonymous and can still be used to identify users, potentially leading to harm.
Hashing, viewed as a common and useful technique for data authentication and security data storage, fails as an anonymization method. Using the same hashing algorithm on the same data generates identical hashed text, allowing reidentification of individuals.
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