The database spilled secrets it was never meant to share. That’s what happens when fields stay in plain text. Field-level encryption is the fix—and a proof of concept is the fastest way to see how it works in your stack.
Field-level encryption protects data at the most granular level. Rather than encrypting an entire database or table, you encrypt specific fields—like SSNs, credit card numbers, or medical records—directly at write-time. The encryption key never travels with the data. Only authorized services or clients with the right key can read those fields.
The proof of concept starts by defining which fields require protection. Choose a strong encryption algorithm, such as AES-256-GCM. Generate keys and store them in a secure key management system (KMS). Integrate encryption at the API or ORM layer so the field is transformed before hitting storage. This keeps the data always encrypted at rest.
For reading data, the service calls the KMS to retrieve the decryption key. This step must be guarded—limit it to users or systems that absolutely need it. Implement strict access controls and audit every request. In most modern distributed systems, this means tight IAM policies, token-based authentication, and logging at the application layer.