Which of the following is NOT typically used for data integrity checks?

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The main idea here is how data integrity is maintained—the trust that data is accurate and unchanged over time. Validation rules ensure input data meets required formats or ranges, catching errors at the point of entry. Constraints enforce rules within the database itself, like not allowing nulls where data is required or ensuring unique primary keys, so bad data can’t be stored. Audit trails log who changed data and when, providing a trail to verify and reconstruct data histories, which helps detect and investigate integrity breaches.

Encryption keys, however, are used to protect confidentiality by making data unreadable to unauthorized parties. They don’t verify that data is correct or unchanged by themselves. To check integrity, you’d typically rely on checksums, hashes, digital signatures, or message authentication codes—often involving separate keys or algorithms—not the encryption keys alone. That’s why encryption keys are not typically used for data integrity checks.