Verhoeff Checksum
A mathematical algorithm used to validate Aadhaar numbers by checking the last digit against a computed checksum, reducing false positives in PII detection
Definition
A mathematical algorithm used to validate Aadhaar numbers by checking the last digit against a computed checksum, reducing false positives in PII detection.
Why It Matters for AI Governance
Simple regex patterns match any 12-digit number, producing many false positives. The Verhoeff checksum algorithm validates the mathematical structure of Aadhaar numbers, reducing false positive rates by over 90% compared to regex-only detection.
How CrewCheck Handles This
CrewCheck's LLM gateway applies verhoeff checksum-related controls at the request boundary. Every AI call passes through detection, policy evaluation, and audit logging — ensuring that verhoeff checksum is addressed consistently across all teams and providers.
The governance dashboard provides real-time visibility into verhoeff checksum events, with drill-down capabilities for compliance officers and exportable evidence for auditors.