Privacy preservation is the practice and set of techniques for protecting personal or sensitive information against unauthorised access, inference, or disclosure while still permitting useful processing. It spans cryptographic methods, data minimisation, anonymisation, and policy controls. It is foundational to compliant data systems and to trust in digital services.
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- Approaches include encryption at rest and in transit, differential privacy for statistical release, secure multiparty computation and homomorphic encryption for computation on encrypted data, and anonymisation or pseudonymisation of stored records. Effective privacy preservation combines these technical controls with governance, consent management, and data-minimisation policies to meet regulatory obligations.