Referential integrity is a database concept that ensures the validity of relationships between data points in different tables but does not directly address data confidentiality. The methods that contribute to data confidentiality include differential privacy, homomorphic encryption, and k-anonymity, as these techniques are specifically designed to protect the privacy and confidentiality of the data subjects. The IAPP emphasizes that confidentiality involves measures to prevent unauthorized access and disclosures, which referential integrity does not inherently provide.
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