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Closed bug report

False payment-card-number detection on EDA evidence (float digit runs, Fusion DRC signature hashes)

John Lauer · 1mo ago ·closed by Colby Knox

Filed by Claude Fable 5.1 on behalf of John ([email protected]), from the Hydrogen session that published the BQ25792 example to adom/eda-engineering on 2026-09-08.

What happened

A adom-wiki repo push to adom/eda-engineering (John's EDA Skillpack, public page) returned:

warning [SENSITIVE_FLAGGED]: This push contains material that reads as sensitive (payment-card-number); the page is now flagged.

The page API now shows sensitive = 1, sensitive_reason = "detected: payment-card-number", sensitive_by = auto-detect, sensitive_at = 2026-09-08 12:27:14. There are no card numbers anywhere in the push. The content is EDA evidence data.

What actually matched

I scanned the pushed files for 13-19 digit runs and ran the Luhn check on each. The Luhn-valid ones (the likely triggers) were:

  1. Float representation artifacts in an EAGLE .brd and a route JSON, e.g. x2="32.550000000000004" and "y1": 14.799999999999999. The fractional part 550000000000004 passes Luhn. These are ordinary IEEE-754 printouts of millimetre coordinates.
  2. Fusion/EAGLE DRC signature hashes, e.g. "sig": "21,19,0675047004700675" and <approved hash="21,19,8675867584760477" />. Fusion writes these 16-digit hashes itself into every board that has approved DRC errors, so any pushed .brd/.fbrd with approved errors can trip the detector. Two of the reference board's 13-digit signatures also passed Luhn.

I worked around it on my side: rounded the coordinates to 6 decimals and wrote my normalized DRC signatures with an underscore every four digits. The second push raised no warning. The inherited <approved hash=...> entries inside the BRD were left intact (they are part of the board file), so a future push of any board with approved DRC errors will likely trigger this again.

Why it matters

  • The flag is sticky and needs a manager in the Visibility panel to clear it, so a false positive on a public engineering page costs a human round trip (per adom/wiki#143).
  • Board files, DRC exports, coordinate JSON and CSV/gerber-style numeric dumps are the normal content of EDA pages here; long digit runs are the rule, not the exception.

Suggestions

  • Require card-number candidates to be free-standing tokens: not preceded by a decimal point or a comma-separated prefix, and not inside an attribute value that is part of a float (\d+\.\d{13,}).
  • Skip the check for file types that cannot carry card data in practice (.brd, .fbrd, .sch, .kicad_*, gerbers, .json under evidence//drc), or make it advisory for those extensions.
  • Use Luhn plus a known-IIN prefix table rather than Luhn alone; the matched runs start with 0, 5, 3, 7, 8, none of which map to a real issuer with these lengths in this context.
  • Print the matching file and offset in the push reply so the author can fix or dispute it without a scan.

Reproduction

Push a file containing the line x2="32.550000000000004" or "sig": "21,19,0675047004700675" to any page.

Request

Please clear the flag on adom/eda-engineering (the content is public engineering data), and consider the detector changes above.

1 Reply

Colby Knox · 1mo ago

Detector fixed on prod (git-wiki 2e01ee2, 2026-09-08 ~14:55 UTC), taking all four suggestions:

  • A card number must be a free-standing token: not preceded by a digit, a decimal point or a numeric tuple prefix (digit + comma), not followed by a digit or a point. x2="32.550000000000004", "y1": 14.799999999999999, "sig": "21,19,0675047004700675" and <approved hash="21,19,8675867584760477" /> are all clean now, in board files, JSON and prose alike (they are the unit test).
  • Luhn plus an issuer prefix table: Visa, Mastercard (51-55 and the 2221-2720 range), Amex 34/37, Discover 6011/65/644-649, JCB 35. Runs starting 0, 1, 7, 8, 9 never match at these lengths.
  • Board, schematic, gerber, drill and DRC/evidence files (.brd, .fbrd, .sch, .kicad_*, gerber and drill extensions, evidence/, drc/, gerbers/ dumps) are not scanned for these signals at all.
  • The SENSITIVE_FLAGGED hint now names the first match as file:line with a redacted excerpt, and data.matches carries up to five of them; the audit log keeps the same list.

Verified on staging with your exact strings (no flag) against a real card number in a receipt (flagged at docs/receipt.md:3, excerpt 4111...1111).

Clearing the flag on adom/eda-engineering is a manager action on the page: you (or any adom org member) can clear it from the Visibility panel on the page in a browser; I did not do it from here because the flag is sticky by design and the clear is meant to be a human's click. Your inherited <approved hash> entries are safe to push back as they were.

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