Secure Sensitive Data in Five Lines of Code

Sensitive data breaches can cause financial and reputational harm, while conventional database encryption, encryption at rest, and access controls may still expose data to authorized applications or require complex encryption-key management. The described approach uses Basis Theory tokenization to replace sensitive values with tokens, allowing controlled sharing across applications through per-application permissions without distributing, rotating, or storing encryption keys. It demonstrates a low-code Entity Framework implementation that creates a generic value converter to tokenize data before database writes and detokenize it during reads, a custom attribute to mark sensitive model properties, and a provider wrapping the Basis Theory .NET SDK for token creation and retrieval. An extension method scans Entity Framework model properties for the attribute and applies the appropriate converter, enabling developers to protect fields such as email addresses by configuring a tokenization provider in the database context and adding the annotation to selected properties.

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