Credit Card detection
A publicly auditable detection pattern in the LeakSnitch engine. Category: Personal Data (PII). Severity: Critical.
Short answer
LeakSnitch detects credit card with a base score of 95 (Critical severity). The pattern below is fully public, so any security team can verify exactly what gets flagged before rollout.
\b(\d{13,19})\bBase score
95 / 100
Severity
Critical
Category
Personal Data (PII)
Why it matters
Card numbers are confirmed with the Luhn checksum before flagging, which keeps order IDs and tracking numbers from false positives.
In the LeakSnitch engine this pattern is one of 58 public rules combined with context signals, entropy analysis, and checksum validators. A single match never blocks by itself; the full context aware scoring decides whether credit card in a prompt is a real leak or a false positive.
Frequently asked questions
Why is the credit card pattern public?
LeakSnitch's competitive advantage is the context aware engine, not hidden regexes. Publishing every pattern lets security teams audit, test, and trust the detection before it ships to their organization.
Can I test this credit card pattern?
Yes. Paste sample text into the free LeakSnitch scanner in your browser and watch the exact detection in action, including severity and scoring.
Does LeakSnitch use other signals for credit card?
This public pattern is the format based layer. The engine adds context signals, disclosure phrasing, entropy fallback, and checksum validation to confirm high confidence before blocking.
Related patterns
Stop AI leaks on the device, not in the cloud.
Install LeakSnitch in under 30 seconds and protect every prompt sent to ChatGPT, Claude, Gemini, and 25+ AI tools. Free for individuals.